本机调试运行LocalDebugTest时 VirtualMachine.attach 失败 求解。

[binbin0325]

VirtualMachine.attach 失败 发现 AttachProvider.providers() 返回的list size=0

pid:244676

[Ljava.lang.String;@42b61c8f244676Start arthas failed, exception stack trace: 
Disconnected from the target VM, address: '127.0.0.1:50732', transport: 'socket'
java.lang.NullPointerException
	at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:182)
	at com.taobao.arthas.core.Arthas.attachAgent(Arthas.java:68)
	at com.taobao.arthas.core.Arthas.<init>(Arthas.java:26)
	at com.taobao.arthas.core.Arthas.main(Arthas.java:98)
	at LocalDebugTest$1.run(LocalDebugTest.java:33)
	at java.lang.Thread.run(Thread.java:748)

Process finished with exit code -1

[Hearen]

Encountered the same issue and details are:

Environment

• Arthas version: 3.0.4
• Operating System version: 16.04.1-Ubuntu 2018 x86_64 x86_64 x86_64 GNU/Linux
• Java version of target JVM: jdk1.8.0_144
• Java version of JVM used to attach: jdk1.8.0_144

Steps to reproduce this issue

1. Just run the **/arthas/core/src/test/java/LocalDebugTest.java in debug mode;

Expected Result

Arthas server started and print out:

代码植入成功

Actual Result

Error as:

/opt/jdk1.8.0_144/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:44829,suspend=y,server=n -Dvisualvm.id=78064397008490 -Dfile.encoding=UTF-8 -classpath /opt/jdk1.8.0_144/jre/lib/charsets.jar:/opt/jdk1.8.0_144/jre/lib/deploy.jar:/opt/jdk1.8.0_144/jre/lib/ext/cldrdata.jar:/opt/jdk1.8.0_144/jre/lib/ext/dnsns.jar:/opt/jdk1.8.0_144/jre/lib/ext/jaccess.jar:/opt/jdk1.8.0_144/jre/lib/ext/jfxrt.jar:/opt/jdk1.8.0_144/jre/lib/ext/localedata.jar:/opt/jdk1.8.0_144/jre/lib/ext/nashorn.jar:/opt/jdk1.8.0_144/jre/lib/ext/sunec.jar:/opt/jdk1.8.0_144/jre/lib/ext/sunjce_provider.jar:/opt/jdk1.8.0_144/jre/lib/ext/sunpkcs11.jar:/opt/jdk1.8.0_144/jre/lib/ext/zipfs.jar:/opt/jdk1.8.0_144/jre/lib/javaws.jar:/opt/jdk1.8.0_144/jre/lib/jce.jar:/opt/jdk1.8.0_144/jre/lib/jfr.jar:/opt/jdk1.8.0_144/jre/lib/jfxswt.jar:/opt/jdk1.8.0_144/jre/lib/jsse.jar:/opt/jdk1.8.0_144/jre/lib/management-agent.jar:/opt/jdk1.8.0_144/jre/lib/plugin.jar:/opt/jdk1.8.0_144/jre/lib/resources.jar:/opt/jdk1.8.0_144/jre/lib/rt.jar:/home/hearen/git/personal/arthas/core/target/test-classes:/home/hearen/git/personal/arthas/core/target/classes:/home/hearen/.m2/repository/org/ow2/asm/asm/6.0/asm-6.0.jar:/home/hearen/.m2/repository/org/ow2/asm/asm-commons/6.0/asm-commons-6.0.jar:/home/hearen/.m2/repository/org/ow2/asm/asm-tree/6.0/asm-tree-6.0.jar:/home/hearen/.m2/repository/com/alibaba/middleware/termd-core/1.1.5/termd-core-1.1.5.jar:/home/hearen/.m2/repository/io/netty/netty-common/4.1.29.Final/netty-common-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-buffer/4.1.29.Final/netty-buffer-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-transport/4.1.29.Final/netty-transport-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-resolver/4.1.29.Final/netty-resolver-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-handler/4.1.29.Final/netty-handler-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-codec/4.1.29.Final/netty-codec-4.1.29.Final.jar:/home/hearen/.m2/repository/io/netty/netty-codec-http/4.1.29.Final/netty-codec-http-4.1.29.Final.jar:/home/hearen/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.7.4/jackson-core-2.7.4.jar:/home/hearen/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.7.4/jackson-databind-2.7.4.jar:/home/hearen/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.7.0/jackson-annotations-2.7.0.jar:/home/hearen/.m2/repository/com/alibaba/middleware/cli/1.0.1/cli-1.0.1.jar:/home/hearen/.m2/repository/com/taobao/text/text-ui/0.0.2/text-ui-0.0.2.jar:/home/hearen/.m2/repository/com/fifesoft/rsyntaxtextarea/2.5.8/rsyntaxtextarea-2.5.8.jar:/home/hearen/.m2/repository/org/slf4j/slf4j-api/1.7.5/slf4j-api-1.7.5.jar:/home/hearen/.m2/repository/ch/qos/logback/logback-classic/1.1.3/logback-classic-1.1.3.jar:/home/hearen/.m2/repository/ch/qos/logback/logback-core/1.1.3/logback-core-1.1.3.jar:/home/hearen/.m2/repository/com/taobao/middleware/logger.api/0.2.6/logger.api-0.2.6.jar:/home/hearen/.m2/repository/com/taobao/middleware/logger.core/0.2.6/logger.core-0.2.6.jar:/home/hearen/.m2/repository/com/taobao/middleware/logger.pandolet/0.2.6/logger.pandolet-0.2.6.jar:/home/hearen/.m2/repository/com/alibaba/fastjson/1.2.33/fastjson-1.2.33.jar:/home/hearen/.m2/repository/ognl/ognl/3.1.12/ognl-3.1.12.jar:/home/hearen/.m2/repository/org/javassist/javassist/3.20.0-GA/javassist-3.20.0-GA.jar:/home/hearen/.m2/repository/junit/junit/4.11/junit-4.11.jar:/home/hearen/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:/home/hearen/.m2/repository/org/benf/cfr/0.132/cfr-0.132.jar:/home/hearen/.m2/repository/org/powermock/powermock-module-javaagent/1.7.4/powermock-module-javaagent-1.7.4.jar:/home/hearen/.m2/repository/org/powermock/powermock-core/1.7.4/powermock-core-1.7.4.jar:/home/hearen/.m2/repository/org/powermock/powermock-reflect/1.7.4/powermock-reflect-1.7.4.jar:/home/hearen/.m2/repository/org/objenesis/objenesis/2.4/objenesis-2.4.jar:/home/hearen/.m2/repository/org/mockito/mockito-core/2.8.9/mockito-core-2.8.9.jar:/home/hearen/.m2/repository/net/bytebuddy/byte-buddy/1.6.14/byte-buddy-1.6.14.jar:/home/hearen/.m2/repository/net/bytebuddy/byte-buddy-agent/1.6.14/byte-buddy-agent-1.6.14.jar:/home/hearen/Downloads/idea-IU-172.4343.14/lib/idea_rt.jar LocalDebugTest
Connected to the target VM, address: '127.0.0.1:44829', transport: 'socket'
pid:32218
Start arthas failed, exception stack trace: 
java.lang.NullPointerException
	at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:182)
	at com.taobao.arthas.core.Arthas.attachAgent(Arthas.java:67)
	at com.taobao.arthas.core.Arthas.<init>(Arthas.java:25)Disconnected from the target VM, address: '127.0.0.1:44829', transport: 'socket'

	at com.taobao.arthas.core.Arthas.main(Arthas.java:96)
	at LocalDebugTest$1.run(LocalDebugTest.java:32)
	at java.lang.Thread.run(Thread.java:748)

Process finished with exit code 255

As @sanxun0325 pointed out the AttachProvider.providers(); returns an empty list.

F.Y.I

1. VirtualMachine lies here: ~/.m2/repository/org/powermock/powermock-module-javaagent/1.7.4/powermock-module-javaagent-1.7.4.jar!/com/sun/tools/attach/VirtualMachine.class
2. tried mvn clean compile in **/arthas/core but still no luck there.

@ralf0131 @hengyunabc

[hengyunabc]

Please refer to https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md , I will remove LocalDebugTest.

[hengyunabc]

如果 https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md 里有说明不清楚的地方，我再补充说明下。

[Hearen]

如果 https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md 里有说明不清楚的地方，我再补充说明下。

@hengyunabc I started this issue too: #203 even after checking the details in the doc.

It would be great if you could elaborate the doc as you mentioned.

[binbin0325]

@hengyunabc 对于在idea中调试程序，希望能详细说明下步骤。因为执行LocalDebugTest 一直attach 失败，返回null。

[Hearen]

@ralf0131 cc @hengyunabc It's NOT just about LocalDebugTest

... I will remove LocalDebugTest.

It's that I could NOT debug Arthas in IntelliJ. Please take a look at #203 and also the current issue #204 #196

[hengyunabc]

@Hearen @sanxun0325 #222