com/sun/tools/attach/VirtualMachine in OpenJDK 7 & 8

[Daniel D. Daugherty]

Henri,

Try adding $JAVA_HOME/lib/tools.jar to your classpath...

Dan


On 4/13/12 7:34 AM, Henri Gomez wrote:
> I tried to use CRASH (http://vietj.github.com/crash/), a nice JVM
> console, with OpenJDK 7 (and 8) on OSX using community build
> (http://code.google.com/p/openjdk-osx-build/)/
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> com/sun/tools/attach/VirtualMachine
> 	at org.crsh.standalone.CRaSH.main(CRaSH.java:92)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:601)
> 	at org.crsh.cmdline.matcher.MethodMatch.doInvoke(MethodMatch.java:153)
> 	at org.crsh.cmdline.matcher.CommandMatch.invoke(CommandMatch.java:76)
> 	at org.crsh.standalone.CRaSH.main(CRaSH.java:237)
> Caused by: java.lang.ClassNotFoundException: com.sun.tools.attach.VirtualMachine
> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
> 	... 8 more
>
> Source code is here :
>
> https://github.com/vietj/crash/blob/master/shell/core/src/main/java/org/crsh/standalone/CRaSH.java
>
> Exception occurs in :
>
> VirtualMachine vm = VirtualMachine.attach("" + pid);
> vm.loadAgent(f.getCanonicalPath(), options);
>
> Some search in Google reported a possible missing lib attach
> (https://bbs.archlinux.org/viewtopic.php?id=131700)
>
> But libattach is bundled in JVM :
>
> /Library/Java/JavaVirtualMachines/1.7.0u4.jdk/Contents/Home/jre/lib/libattach.dylib
>
> Is it a known issue for OpenJDK 7 or is it specific to OSX implementation ?
>
> Cheers