i want to trace a application which is run by using a tcserver. But it is not allowing the btrace to connect with the port. Normal tomcat applications are being traced but the application which use tcserver is not possible to trace. #168 is the type of error i am getting when i try to trace the application with tcserver. I tried to print the debug information while running the applicaiton and i am getting the following result DEBUG: accepting port 2024 DEBUG: assuming default classpath '.' . . . . DEBUG: loaded /usr/java/btracebin/build/btrace-agent.jar DEBUG: registering shutdown hook DEBUG: registering signal handler for SIGINT DEBUG: submitting the BTrace program DEBUG: opening socket to 2024 DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... . . . . . . . DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... DEBUG: server not yet available; retrying ... Exception in thread "main" java.lang.NullPointerException at com.sun.btrace.client.Client.submit(Client.java:353) at com.sun.btrace.client.Main.main(Main.java:189) DEBUG: sending exit command Exception in thread "Thread-0" java.lang.IllegalStateException at com.sun.btrace.client.Client.send(Client.java:458) at com.sun.btrace.client.Client.sendExit(Client.java:392) at com.sun.btrace.client.Main$2.run(Main.java:226) at java.lang.Thread.run(Thread.java:745)

I think this issue is related to: #160

I have been using BTrace to trace a Java application, my BTrace script/class is:

    package com.negafinity.btrace;
    
    import com.sun.btrace.BTraceUtils;
    import com.sun.btrace.Profiler;
    import com.sun.btrace.annotations.BTrace;
    import com.sun.btrace.annotations.Duration;
    import com.sun.btrace.annotations.Kind;
    import com.sun.btrace.annotations.Location;
    import com.sun.btrace.annotations.OnMethod;
    import com.sun.btrace.annotations.OnTimer;
    import com.sun.btrace.annotations.ProbeMethodName;
    import com.sun.btrace.annotations.Property;
    
    @BTrace
    public class Logger
    {
    	@Property
    	static Profiler profiler = BTraceUtils.Profiling.newProfiler();
    
    	@OnMethod(clazz = "/^(?!sun|java).*$/", method = "/.*/")
    	public static void entry(@ProbeMethodName(fqn = true) String probeMethod)
    	{
    		BTraceUtils.Profiling.recordEntry(profiler, probeMethod);
    	}
    
    	@OnMethod(clazz = "/^(?!sun|java).*$/", method = "/.*/", location = @Location(value = Kind.RETURN))
    	public static void exit(@ProbeMethodName(fqn = true) String probeMethod, @Duration long duration)
    	{
    		BTraceUtils.Profiling.recordExit(profiler, probeMethod, duration);
    	}
    
    	@OnTimer(300000)
    	public static void timer()
    	{
    		BTraceUtils.println("Logging Time: " + BTraceUtils.Time.millis() + " " + BTraceUtils.timestamp());
    		BTraceUtils.Profiling.printSnapshot("Profiler Output:", profiler);
    	}
    }

The issue I'm having is while the application is running, it sometimes crashes with this exception:

    java.lang.VerifyError: Bad type on operand stack
    Exception Details:
      Location:
        com/pixelmonmod/pixelmon/entities/pixelmon/helpers/EvolutionQuery.updateAllAround(Lcom/pixelmonmod/pixelmon/comm/packetHandlers/evolution/EvolutionStage;)V @39: getfield
      Reason:
        Type 'java/lang/Object' (current frame, stack[2]) is not assignable to 'net/minecraft/entity/EntityLivingBase'
      Current Frame:
        bci: @39
        flags: { }
        locals: { 'com/pixelmonmod/pixelmon/entities/pixelmon/helpers/EvolutionQuery', 'com/pixelmonmod/pixelmon/comm/packetHandlers/evolution/EvolutionStage', long, long_2nd, long, long_2nd, 'java/lang/Object' }
        stack: { uninitialized 33, uninitialized 33, 'java/lang/Object' }
      Bytecode:
        0x0000000: 0941 b802 8e37 0413 02ac b802 882a b400
        0x0000010: 32b6 0042 3a06 1906 c700 092a b400 323a
        0x0000020: 06bb 0007 5919 06b4 0223 1906 b402 2719
        0x0000030: 06b4 022a 1906 b402 2d14 022e b702 323a
        0x0000040: 07b2 00ba bb02 3459 2ab4 003c 2bb7 0237
        0x0000050: 1907 b602 3bb8 028e 1604 6541 1302 ac20
        0x0000060: b802 92b1                              
      Stackmap Table:
        append_frame(@33,Long,Long,Object[#4])
    
    	at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.startEvolution(EntityPixelmon.java:497)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.evolution.Evolution.evolve(Evolution.java:81)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.evolution.Evolution.handleEvolution(Evolution.java:64)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.checkEvolution(EntityPixelmon.java:549)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.Level.tryEvolution(Level.java:329)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.checkEvolution(BattleControllerBase.java:845)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.endBattleWithoutXP(BattleControllerBase.java:837)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.forfeitBattle(BattleControllerBase.java:1039)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.forfeitOrFlee(BattleControllerBase.java:956)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.tryFlee(BattleControllerBase.java:936)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.takeTurn(BattleControllerBase.java:910)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.update(BattleControllerBase.java:352)
    	at com.pixelmonmod.pixelmon.battles.BattleRegistry.updateBattles(BattleRegistry.java:151)
    	at com.pixelmonmod.pixelmon.battles.BattleTickHandler.tickStart(BattleTickHandler.java:12)
    	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_36_BattleTickHandler_tickStart_WorldTickEvent.invoke(.dynamic)
    	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
    	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:635)
    	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:591)
    	at net.minecraftforge.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:269)
    	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:718)
    	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)
    	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
    	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
    	at java.lang.Thread.run(Thread.java:745)
    
    
    A detailed walkthrough of the error, its code path and all known details is as follows:
    ---------------------------------------------------------------------------------------
    
    -- Head --
    Thread: Server thread
    Stacktrace:
    	at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.startEvolution(EntityPixelmon.java:497)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.evolution.Evolution.evolve(Evolution.java:81)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.evolution.Evolution.handleEvolution(Evolution.java:64)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.EntityPixelmon.checkEvolution(EntityPixelmon.java:549)
    	at com.pixelmonmod.pixelmon.entities.pixelmon.stats.Level.tryEvolution(Level.java:329)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.checkEvolution(BattleControllerBase.java:845)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.endBattleWithoutXP(BattleControllerBase.java:837)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.forfeitBattle(BattleControllerBase.java:1039)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.forfeitOrFlee(BattleControllerBase.java:956)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.tryFlee(BattleControllerBase.java:936)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.takeTurn(BattleControllerBase.java:910)
    	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.update(BattleControllerBase.java:352)
    	at com.pixelmonmod.pixelmon.battles.BattleRegistry.updateBattles(BattleRegistry.java:151)
    	at com.pixelmonmod.pixelmon.battles.BattleTickHandler.tickStart(BattleTickHandler.java:12)
    	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_36_BattleTickHandler_tickStart_WorldTickEvent.invoke(.dynamic)
    	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
    	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:635)
    	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:591)
    	at net.minecraftforge.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:269)

I decompiled the code that it crashed on; according to the error the most accurate one is this:

private void updateAllAround(final EvolutionStage currentStage) {
        EntityLivingBase owner = this.pixelmon.func_70902_q();
        if (owner == null) {
            owner = (EntityLivingBase)this.pixelmon;
        }
        final NetworkRegistry.TargetPoint point = new NetworkRegistry.TargetPoint(owner.field_71093_bK, owner.field_70165_t, owner.field_70163_u, owner.field_70161_v, 60.0);
        Pixelmon.network.sendToAllAround((IMessage)new EvolvePokemon(this.pokemonID, currentStage), point);
    }

Outdated

~~After researching the error for some time I found one that seems similar on JavaAssist's JIRA:~~

    Please see attached Eclipse project. In the JavassistErrorDemo.java if you run the program with line 64 uncommented, it works. However, including line 64 causes the program to fail with the following stack trace:
    Exception in thread "main" java.lang.VerifyError: Bad type on operand stack
    Exception Details:
    Location:
    com/javassist/test/Student$CopyExtractor.getValueList(Ljava/lang/Object;)Ljava/lang/String; @58: invokevirtual
    Reason:
    Type 'java/lang/Object' (current frame, stack[0]) is not assignable to 'com/javassist/test/GradeConverter'
    Current Frame:
    bci: @58
    flags: { }
    locals:
    { 'com/javassist/test/Student$CopyExtractor', 'java/lang/Object', 'java/lang/StringBuilder', 'com/javassist/test/Student', 'java/lang/Object' }
    stack:
    { 'java/lang/Object', 'com/javassist/test/Grade' }
    Bytecode:
    0000000: bb00 0c59 b700 104d 2bc0 0012 4e2c 2db6
    0000010: 0016 b600 1a57 2c12 1cb6 001a 572c 2db6
    0000020: 0020 b600 2357 2c12 1cb6 001a 5712 25b6
    0000030: 002b 3a04 1904 2db6 002f b600 3357 2c2d
    0000040: b600 2fb6 0036 572c b600 39b0 3a05 bb00
    0000050: 3d59 1905 b700 40bf 
    Exception Handler Table:
    bci [0, 76] => handler: 76
    Stackmap Table:
    same_locals_1_stack_item_extended(@76,Object59)
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2658)
    at java.lang.Class.getConstructor0(Class.java:2964)
    at java.lang.Class.newInstance(Class.java:403)
    at com.javassist.test.JavassistErrorDemo.makeClass(JavassistErrorDemo.java:83)
    at com.javassist.test.JavassistErrorDemo.main(JavassistErrorDemo.java:37)

~~The reply shed some light on my issue:~~

   The verification failed because the source code:
        com.javassist.test.GradeConverter c2 = com.javassist.test.GradeConverter.class.newInstance();
    
        must be
    
        com.javassist.test.GradeConverter c2 = (com.javassist.test.GradeConverter)com.javassist.test.GradeConverter.class.newInstance();
      
     Note that the cast operator is missing in the original. Although this cast is optional in Java 5 and later, the Javassist compiler assumes the source is in Java 4 (no generics!). This does not mean any performance penalties because the cast is still necessary in Java 8 at bytecode level.
       
     It is a sort of bug that Javassist does not report a type error. This design decision is just for avoiding runtime overhead.

~~So, based on this I figure the issue has to do with the fact that the Object in the code I decompiled is first set to an Entity (although in this case, it seems to be null) and then is changed to an EntityLivingBase~~

~~My question is, why would this be an issue when I attach BTrace to the Java application? Without my program attached, the application doesn't crash.~~

Even if i am using the jdk of the application it is still crashing.

i am getting an error java.lang.reflect.InvocationTargetException

caused by java.lang.VerifyError

• The easiest way to use gradle for a newcomer is "./gradlew build".
• "./gradlew tasks" gives an overview of the available tasks (comparable to ant targets).
• Tests should run & JAR creation should work.
• Unaltered BTraceFunctionalTests fail on my box, because the client tries to open the socket before the server has opened it. I get around this by letting the client retry the socket creation. But changing productive code only to make a test pass is usually not a good strategy . . . (can provide debug log for this).
• Haven't tested building on Solaris with dtrace.jar.
• Haven't touched subproject "benchmark" because of compile problems.
• Didn't implement uploading to external repositories. Yet, publishing to maven local should work.
• Adding a gradle distribution task for zip & tgz creation should be fairly easy.
• I suggest completing the gradle script and subsequently morphing the project structure to the grade/maven standard layout. This would simplify the build.

This issue is similar to #411. But I didn't find the solution at #411 I just use the example HelloWorld Class in docs/BTrace Tutorial

package extra;
abstract public class HelloWorld extends HelloWorldBase {
    protected int field = 0;
    public static void main(String[] args) throws Exception {
        System.out.println("ready when you are ...");
        System.in.read();
        callA();
    }
    private static void callA() {
        HelloWorld instance = new HelloWorldExt();
        long x = System.nanoTime();
        instance.callA("hello", 13);
        System.out.println("dur = " + (System.nanoTime() - x));
    }
    private void callA(String a, int b) {
        field++;
        callB(callC(a, b));
        field--;
    }
    private void callB(String s) {
        field++;
        System.out.println("You want " + s);
        field--;
    }
    abstract protected String callC(String a, int b);
}

and HelloWorldTrace

package helloworld;
import ...;

@BTrace 
public class HelloWorldTrace {
    @OnMethod(clazz="extra.HelloWorld")
    public static void onMethod(@ProbeMethodName String pmn) {
        println("Hello from method " + pmn);
    }
}

The console showed:

ready when you are ...
btrace INFO: "org.openjdk.btrace.core.cmdQueueLimit" not provided. Using the default cmd queue limit of 100
btrace INFO: Can not load runtime factory: org.openjdk.btrace.runtime.BTraceRuntimeImpl_9$Factory
btrace INFO: Can not load runtime factory: org.openjdk.btrace.runtime.BTraceRuntimeImpl_11$Factory
he
You want # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # hello-13
dur = 7233700

I didn't see the method names and any outputs like "println("Hello from method " + pmn);"

Java version:

java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)

Btrace version:

BTrace v.2.0.2 (6c0570ff2338a3708e90cfaad3bac80904c79633)

on Windows10

I appreciate your quick response. Thanks.

After testing extensively, I was able to produce the following exception. I am not sure how this error is happening, and furthermore it appears that the try catch block that should catch an exception like this was never called.

This error is especially odd because BTraceRuntime#recordExit shouldn't cause any issues as far as I can see.. https://github.com/hsyyid/btrace/blob/79e00d142437f4e435600851c60d5ef63dafd904/src/share/classes/com/sun/btrace/BTraceRuntime.java#L1947

The code that it appears to be injected into is https://github.com/SpongePowered/SpongeCommon/blob/eb4dbb5e5c85306c7bd50421a7419f03b8bec15f/src/main/java/org/spongepowered/common/util/gen/AbstractBlockBuffer.java#L55

Unsure if that has any effect.

Any insight on why this is happening and how to prevent it would be very useful.

(Also, no I am not able to reproduce this consistently, although I can try to see if I can)

Thanks!

Stacktrace:

java.lang.Error
	at com.sun.btrace.BTraceRuntime.recordExit(BTraceRuntime.java:1948)
	at com.sun.btrace.BTraceUtils$Profiling.recordExit(BTraceUtils.java:5149)
	at org.spongepowered.common.util.gen.AbstractBlockBuffer.$btrace$com$negafinity$btrace$Logger$exit(AbstractBlockBuffer.java)
	at org.spongepowered.common.util.gen.AbstractBlockBuffer.checkRange(AbstractBlockBuffer.java:59)
	at org.spongepowered.common.util.gen.ChunkPrimerBuffer.setBlock(ChunkPrimerBuffer.java:81)
	at net.minecraft.world.gen.ChunkProviderOverworld.setBedrock(ChunkProviderOverworld.java:815)
	at net.minecraft.world.gen.ChunkProviderOverworld.populate(ChunkProviderOverworld.java:803)
	at org.spongepowered.common.world.gen.SpongeChunkGenerator.func_185932_a(SpongeChunkGenerator.java:243)
	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:140)
	at net.minecraft.world.World.func_72964_e(World.java:303)
	at net.minecraft.world.World.func_175726_f(World.java:298)
	at net.minecraft.world.WorldServer.func_180495_p(WorldServer.java:3104)
	at net.minecraft.world.World.getBlock(World.java:4866)
	at org.spongepowered.api.world.extent.BlockVolume.getBlock(BlockVolume.java:97)
	at org.spongepowered.api.world.Location.getBlock(Location.java:513)
	at org.spongepowered.common.data.property.store.common.AbstractBlockPropertyStore.getFor(AbstractBlockPropertyStore.java:98)
	at org.spongepowered.common.data.property.PropertyStoreDelegate.getFor(PropertyStoreDelegate.java:59)
	at net.minecraft.world.World.getProperty(World.java:6337)
	at org.spongepowered.api.data.property.LocationBasePropertyHolder.getProperty(LocationBasePropertyHolder.java:52)
	at org.spongepowered.api.util.blockray.BlockRay.advanceOneBlock(BlockRay.java:333)
	at org.spongepowered.api.util.blockray.BlockRay.advance(BlockRay.java:268)
	at org.spongepowered.api.util.blockray.BlockRay.hasNext(BlockRay.java:232)
	at org.spongepowered.api.util.blockray.BlockRay.end(BlockRay.java:260)
	at io.github.nucleuspowered.nucleus.modules.rtp.commands.RandomTeleportCommand$RTPTask.accept(RandomTeleportCommand.java:231)
	at io.github.nucleuspowered.nucleus.modules.rtp.commands.RandomTeleportCommand$RTPTask.accept(RandomTeleportCommand.java:145)
	at org.spongepowered.common.scheduler.SchedulerBase.lambda$startTask$0(SchedulerBase.java:183)
	at org.spongepowered.common.scheduler.SchedulerBase$$Lambda$244/1173213045.run(Unknown Source)
	at org.spongepowered.common.scheduler.SyncScheduler.executeTaskRunnable(SyncScheduler.java:81)
	at org.spongepowered.common.scheduler.SchedulerBase.startTask(SchedulerBase.java:179)
	at org.spongepowered.common.scheduler.SchedulerBase.processTask(SchedulerBase.java:165)
	at org.spongepowered.common.scheduler.SchedulerBase$$Lambda$242/15679756.accept(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4707)
	at org.spongepowered.common.scheduler.SchedulerBase.runTick(SchedulerBase.java:108)
	at org.spongepowered.common.scheduler.SyncScheduler.tick(SyncScheduler.java:51)
	at org.spongepowered.common.scheduler.SpongeScheduler.tickSyncScheduler(SpongeScheduler.java:191)
	at org.spongepowered.mod.SpongeMod.onTick(SpongeMod.java:271)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_10_SpongeMod_onTick_ServerTickEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:632)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:588)
	at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:274)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:602)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
	at java.lang.Thread.run(Thread.java:748)

Hi,

I'm trying to use BTrace to trace a Java EE Application Server, and it works fine when the classes I'm tracing are only instanced once, but when I try to trace a class that has been instanced by different ClassLoaders of differente Web Applications, I get this error in the Application Server Log:

btrace DEBUG: retransforming loaded classes btrace DEBUG: filtering loaded classes btrace DEBUG: candidate class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter added btrace DEBUG: candidate class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter added btrace DEBUG: candidate class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter added btrace DEBUG: candidate class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter added btrace DEBUG: candidate class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter added btrace DEBUG: candidate class weblogic.servlet.internal.session.CoherenceWebSessionData added btrace DEBUG: candidate class weblogic.servlet.internal.RequestEventsFilter added btrace DEBUG: client CoherenceInvalidations$7: got com.sun.btrace.comm.RetransformationStartNotification@240cb732 btrace DEBUG: calling retransformClasses (7 classes to be retransformed) btrace DEBUG: transformed class org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter btrace DEBUG: java.util.concurrent.ExecutionException: java.lang.InternalError java.util.concurrent.ExecutionException: java.lang.InternalError at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:192) at com.sun.btrace.agent.Main.startServer(Main.java:487) at com.sun.btrace.agent.Main.access$000(Main.java:58) at com.sun.btrace.agent.Main$2.run(Main.java:119) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.InternalError at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method) at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144) at com.sun.btrace.agent.Client.retransformLoaded(Client.java:383) at com.sun.btrace.agent.Main$3.run(Main.java:506) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ... 1 more

Do you know why does this happen?

Btrace cannot print info msg on console when using btrace pid scripts.java. but when using btrace -v pid scripts.java, the msg can be printed along with debug info.

the trace scripts:

import org.openjdk.btrace.core.annotations.BTrace;
import org.openjdk.btrace.core.annotations.Injected;
import org.openjdk.btrace.core.annotations.OnMethod;
import org.openjdk.btrace.core.annotations.ProbeClassName;
import org.openjdk.btrace.core.annotations.ProbeMethodName;
import org.openjdk.btrace.core.annotations.Self;
import org.openjdk.btrace.core.annotations.ServiceType;
import org.openjdk.btrace.services.impl.Printer;

import static org.openjdk.btrace.core.BTraceUtils.*;

@BTrace
public class AllMethods {
    @Injected(ServiceType.RUNTIME)
    private static Printer printer;
    @OnMethod(
        clazz="/voldemort\\.server\\..*/", 
        method="/.*/"//"${m}"
    )
    public static void m(@Self Object o, @ProbeClassName String probeClass, @ProbeMethodName String probeMethod) {
        printer.print("q");
        printer.print("entered " + probeClass);
        printer.println("." + probeMethod+"   TIME:"+ Time.millis());
    }
}

Well, I've decided that since I can't get anything to work with BTrace, that I should back up and try some simple examples against a simple Java program running locally on my Windows 7. (That is, I am forgetting about trying to get btrace working against containerized Virgo Tomcat on a Linux node - that's out of my depth).

So....I wrote a simple java program and saved it as a jar file. Its "main" method calls another method (also static) called makeFiles. makeFiles sleeps for 5 seconds and that does a File.createNewFile. It does this "forever".

I found this example on the Web:

import com.sun.btrace.annotations.*;
import com.sun.btrace.BTraceUtils;

@BTrace

public class HelloWorld {
@OnMethod(clazz="java.io.File",method="")
public static void onNewFileCreated(String fileName) {
   BTraceUtils.println("New file is being created");
   BTraceUtils.println(fileName);
 }
}

I pasted it into JVisualVM where it compiles cleanly. But, after starting the jar file and seeing it appear in JVisualVM's left pane, there is no context menu entry for "Trace Application". Please note that there IS such an entry for another JVM (the one associated with the Eclipse editor). I suppose this has to do with Java versions. I started the 1.7.0_03 version of JVisualVM. The class/jar in question was compiled with 1.7.

Any idea what I am doing wrong?

Thanks.

[reporter="joachimhskeie", created="Sat, 3 Oct 2009 21:12:57 +0200"]

I have made a first go at porting the project to Maven. I have moved classes into three subdirectories - btrace-agent, btrace-boot and btrace-client. I have tried to move the classes into the correct sub-project depending on the JAR files that are available, as well as the information in the ANT script supplied with the source.

I am not all that familiar with HG, so I am not sure how to make a DIFF script. I have however Zipped up my project folder, which I am attaching to this issue.

I also do not have enough experience with BTrace as of yet (I plan on starting to use it in a real project soon), so I would need someone more familiar with the project to test that the JARS built does not introduce more bugs.

I am willing to do more work on this port if needed.

$ java -version
openjdk version "15" 2020-09-15
OpenJDK Runtime Environment (build 15+36-1562)
OpenJDK 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)

$ bash -x /usr/local/btrace/bin/btrace -v 29164 IndexServiceTrace.java
+ '[' -z '' -o '!' -d '' ']'
+ PRG=/usr/local/btrace/bin/btrace
++ basename /usr/local/btrace/bin/btrace
+ progname=btrace
++ readlink /usr/local/btrace/bin/btrace
+ PRG=
+ '[' -z '' ']'
+ PRG=/usr/local/btrace/bin/btrace
++ dirname /usr/local/btrace/bin/btrace
+ BTRACE_HOME=/usr/local/btrace/bin/..
++ cd /usr/local/btrace/bin/..
++ pwd
+ BTRACE_HOME=/usr/local/btrace
+ JAVA_ARGS=-XX:+IgnoreUnrecognizedVMOptions
+ '[' -d /opt/elasticsearch/jdk/jmods ']'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED'
+ JAVA_ARGS='-XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED'
+ '[' -f /usr/local/btrace/libs/btrace-client.jar ']'
+ '[' -d /opt/elasticsearch/jdk ']'
+ TOOLS_JAR=/opt/elasticsearch/jdk/lib/tools.jar
+ '[' '!' -f /opt/elasticsearch/jdk/lib/tools.jar ']'
+ TOOLS_JAR=/opt/elasticsearch/jdk/../lib/tools.jar
+ '[' '!' -f /opt/elasticsearch/jdk/../lib/tools.jar ']'
+ '[' '!' -d /opt/elasticsearch/jdk/jmods ']'
+ '[' '!' -f /opt/elasticsearch/jdk/../lib/tools.jar ']'
+ '[' '!' -d /opt/elasticsearch/jdk/jmods ']'
+ /opt/elasticsearch/jdk/bin/java -XX:+IgnoreUnrecognizedVMOptions -XX:+AllowRedefinitionToAddDeleteMethods --add-exports jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED -cp /usr/local/btrace/libs/btrace-client.jar:/opt/elasticsearch/jdk/../lib/tools.jar:/usr/share/lib/java/dtrace.jar org.openjdk.btrace.client.Main -v 29164 IndexServiceTrace.java
OpenJDK 64-Bit Server VM warning: Option AllowRedefinitionToAddDeleteMethods was deprecated in version 13.0 and will likely be removed in a future release.
DEBUG: assuming default port 2020
DEBUG: assuming default classpath '.'
btrace INFO: Attaching BTrace to PID: 29164
DEBUG: compiling IndexServiceTrace.java
DEBUG: compiled IndexServiceTrace.java
DEBUG: Boot classpath: .
DEBUG: attaching to 29164
DEBUG: checking port availability: 2020
DEBUG: attached to 29164
DEBUG: loading /usr/local/btrace-v2.2.0-bin/libs/btrace-agent.jar
DEBUG: agent args: port=2020,statsd=,debug=true,bootClassPath=.,systemClassPath=/opt/elasticsearch-7.9.3/jdk/lib/tools.jar,probeDescPath=.
DEBUG: loaded /usr/local/btrace-v2.2.0-bin/libs/btrace-agent.jar
DEBUG: registering shutdown hook
DEBUG: registering signal handler for SIGINT
DEBUG: submitting the BTrace program
DEBUG: opening socket to 2020
DEBUG: server not yet available; retrying ...
<duplicated lines>
DEBUG: server not yet available; retrying ...
DEBUG: server not available. exiting.
DEBUG: sending exit command
Exception in thread "Thread-0" java.lang.IllegalStateException
	at org.openjdk.btrace.client.Client.send(Client.java:678)
	at org.openjdk.btrace.client.Client.sendExit(Client.java:600)
	at org.openjdk.btrace.client.Main.lambda$registerExitHook$2(Main.java:303)
	at java.base/java.lang.Thread.run(Thread.java:832)

BTrace version: 2.2.0, and port 2020 is available.

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | com.diffplug.spotless | 6.11.0 -> 6.12.1 | | | | |

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• [ ] chore(deps): update plugin com.diffplug.spotless to v6.12.1

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