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https://github.com/hengyunabc/dumpclass

Dump classes from running JVM process.
https://github.com/hengyunabc/dumpclass

bytecode class dump java jvm

Last synced: about 2 months ago
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Dump classes from running JVM process.

Host: GitHub
URL: https://github.com/hengyunabc/dumpclass
Owner: hengyunabc
Created: 2016-02-16T12:57:05.000Z (over 8 years ago)
Default Branch: master
Last Pushed: 2022-08-30T09:27:18.000Z (almost 2 years ago)
Last Synced: 2024-04-16T07:34:49.116Z (3 months ago)
Topics: bytecode, class, dump, java, jvm
Language: Java
Size: 24.4 KB
Stars: 364
Watchers: 16
Forks: 84
Open Issues: 5
Metadata Files:
- Readme: README.md

Lists

awesome-hacking-lists - hengyunabc/dumpclass - Dump classes from running JVM process. (Java)

README

# Dumpclass
Dump classes from running JVM process by sa-jdi.jar.

* Support wildcard match

* Support multi classloader

### Download dumpclass.jar

You can download dumpclass.jar from maven center.

http://search.maven.org/#search%7Cga%7C1%7Cdumpclass

```bash
wget http://search.maven.org/remotecontent?filepath=io/github/hengyunabc/dumpclass/0.0.2/dumpclass-0.0.2.jar -O dumpclass.jar
```

### Usage

```
Usage:
pattern : class name wildcard match pattern
--noStat : do not print dump stat (default: false)
--sensitive : class name wildcard match sensitive. In mac os, try
this option. (default: false)
-c (--classLoaderPrefix) : classLoaderPrefix (default: false)
-o (--outputDir) VAL : outputDir
-p (--pid) N : pid

Example:
java -jar dumpclass.jar -p 4345 *StringUtils
java -jar dumpclass.jar -p 4345 -o /tmp/dump *StringUtils
java -jar dumpclass.jar -p 4345 -o /tmp/dump --classLoaderPrefix *StringUtils
Use the specified sa-jdi.jar:
java -cp './dumpclass.jar:$JAVA_HOME/lib/sa-jdi.jar' io.github.hengyunabc.dumpclass.DumpMain 4345 *StringUtils
```

### Trouble

* Try to use sudo

```
Error attaching to process: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.execute(BsdDebuggerLocal.java:169)
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:287)
at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:671)
at sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:659)
at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:341)
at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.jcore.ClassDump.main(ClassDump.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at io.github.hengyunabc.dumpclass.DumpMain.run(DumpMain.java:132)
at io.github.hengyunabc.dumpclass.DumpMain.doMain(DumpMain.java:68)
at io.github.hengyunabc.dumpclass.DumpMain.main(DumpMain.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at io.github.hengyunabc.dumpclass.DumpMain$2.run(DumpMain.java:184)
at java.lang.Thread.run(Thread.java:745)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process. Could be caused by an incorrect pid or lack of privileges.
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach0(Native Method)
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.access$100(BsdDebuggerLocal.java:65)
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$1AttachTask.doit(BsdDebuggerLocal.java:278)
at sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal$BsdDebuggerLocalWorkerThread.run(BsdDebuggerLocal.java:144)
```

* Make sure use the same jdk version.

```
Attaching to process ID 53577, please wait...
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at io.github.hengyunabc.dumpclass.DumpMain.main(DumpMain.java:101)
Caused by: java.lang.InternalError: void* type hasn't been seen when parsing int*
at sun.jvm.hotspot.HotSpotTypeDataBase.recursiveCreateBasicPointerType(HotSpotTypeDataBase.java:721)
at sun.jvm.hotspot.HotSpotTypeDataBase.lookupType(HotSpotTypeDataBase.java:134)
at sun.jvm.hotspot.HotSpotTypeDataBase.lookupOrCreateClass(HotSpotTypeDataBase.java:631)
at sun.jvm.hotspot.HotSpotTypeDataBase.createType(HotSpotTypeDataBase.java:751)
at sun.jvm.hotspot.HotSpotTypeDataBase.readVMTypes(HotSpotTypeDataBase.java:195)
at sun.jvm.hotspot.HotSpotTypeDataBase.(HotSpotTypeDataBase.java:89)
at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:403)
at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:305)
at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.jcore.ClassDump.main(ClassDump.java:180)
... 5 more
```

* One class loaded by multi ClassLoader

Try to use HSDB. After attach java process, "Tools", "Class Browser".

```bash
sudo java -classpath "$JAVA_HOME/lib/sa-jdi.jar" sun.jvm.hotspot.HSDB
```

### complie dumpclass.jar

```bash
mvn clean package
ls -alh target
```

## License

Apache License V2