Java Attach API: UnsatisfiedLinkError

Question

When using the Java Attach API, I'm getting the following link error on Linux (tried it on different machines) only:

Exception in thread "main" java.lang.UnsatisfiedLinkError: sun.tools.attach.WindowsAttachProvider.tempPath()Ljava/lang/String;
        at sun.tools.attach.WindowsAttachProvider.tempPath(Native Method)
        at sun.tools.attach.WindowsAttachProvider.isTempPathSecure(WindowsAttachProvider.java:74)
        at sun.tools.attach.WindowsAttachProvider.listVirtualMachines(WindowsAttachProvider.java:58)
        at com.sun.tools.attach.VirtualMachine.list(VirtualMachine.java:134)
        at sun.tools.jconsole.LocalVirtualMachine.getAttachableVMs(LocalVirtualMachine.java:151)
        at sun.tools.jconsole.LocalVirtualMachine.getAllVirtualMachines(LocalVirtualMachine.java:110)
        ...

Interestingly, on Solaris and Windows it's working out of the box.

I tried out several combinations of specifying java.library.path to point to the directory which contains the libattach.so but with no luck.

What's wrong here?

And as a bonus question:
Is there a way to see which native library is actually bound to a java class?

Answer 1

Different AttachProvider are used on different platforms. On Linux, it shouldn't use sun.tools.attach.WindowsAttachProvider. It is for Windows.

[solaris] sun.tools.attach.SolarisAttachProvider
[windows] sun.tools.attach.WindowsAttachProvider
[linux]   sun.tools.attach.LinuxAttachProvider

This is configured in a resource file META-INF\services\com.sun.tools.attach.spi.AttachProvider (typically this file exists in tools.jar). It will search CLASSPATH to get first occurrence of this resource file and read the AttachProvider implementation class from it.

So you can probably resolve this problem by search sun.tools.attach.WindowsAttachProvider in your CLASSPATH. Possibly you have included a tools.jar from Windows.