UnsatisfiedLinkError on using JNA direct calls with YourKit Java Profiler instrumentation

[trofimander]

Running JNA code with YourKit Java Profiler agent I get the following error

Error looking up function '$$YJP$$open': /usr/lib/java/jdk6/bin/java: undefined symbol: $$YJP$$open 
java.lang.UnsatisfiedLinkError: Error looking up function '$$YJP$$open': /usr/lib/java/jdk6/bin/java: undefined symbol: $$YJP$$open
    at com.sun.jna.Function.<init>(Function.java:179)
    at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:350)
    at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:330)
    at com.sun.jna.Native.register(Native.java:1369)
    at com.sun.jna.Native.register(Native.java:1033)
    at jtermios.linux.JTermiosImpl$Linux_C_lib_DirectMapping.<clinit>(JTermiosImpl.java:168)
    at jtermios.linux.JTermiosImpl.<clinit>(JTermiosImpl.java:67)
    at jtermios.JTermios.<clinit>(JTermios.java:288)
    at jpty.JPty.execInPTY(JPty.java:273)
    at jpty.JPty.execInPTY(JPty.java:204)
    at com.jediterm.pty.PtyProcess.<init>(Unknown Source)
    at com.jediterm.pty.PtyProcess.<init>(Unknown Source)

Read response from YourKit guys for details: http://forums.yourkit.com/viewtopic.php?f=3&t=3299#p10809
Also this suggestion can be usefull: https://groups.google.com/forum/?fromgroups#!topic/jna-users/z-n85N0emSw

[twall]

Supply a FunctionMapper in your library options when you call Native.register(NativeLibrary) which strips the $$YJP$$ prefix from the method name. Contrary to the yourkit post, it is the profiler's fault that the native mapping is broken. Their technique of "automatically" registering the new native with the JVM breaks when the JNI code doesn't do canonical mapping between Java native method declarations and the native exported symbols (which is the case with JNA and even some parts of the JVM itself).

Even with a type mapper, I'm not certain it'd work; I don't recall offhand if the direct mapping even makes use of a supplied FunctionMapper if one exists in the options.

On May 28, 2013, at 12:47 PM, traff wrote:

Running JNA code with YourKit Java Profiler agent I get the following error

Error looking up function '$$YJP$$open': /usr/lib/java/jdk6/bin/java: undefined symbol: $$YJP$$open
java.lang.UnsatisfiedLinkError: Error looking up function '$$YJP$$open': /usr/lib/java/jdk6/bin/java: undefined symbol: $$YJP$$open
at com.sun.jna.Function.(Function.java:179)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:350)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:330)
at com.sun.jna.Native.register(Native.java:1369)
at com.sun.jna.Native.register(Native.java:1033)
at jtermios.linux.JTermiosImpl$Linux_C_lib_DirectMapping.(JTermiosImpl.java:168)
at jtermios.linux.JTermiosImpl.(JTermiosImpl.java:67)
at jtermios.JTermios.(JTermios.java:288)
at jpty.JPty.execInPTY(JPty.java:273)
at jpty.JPty.execInPTY(JPty.java:204)
at com.jediterm.pty.PtyProcess.(Unknown Source)
at com.jediterm.pty.PtyProcess.(Unknown Source)

Read response from YourKit guys for details: http://forums.yourkit.com/viewtopic.php?f=3&t=3299#p10809

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[twall]

I've verified that direct mapping does take into account any supplied FunctionMapper. It's up to you to add the function mapper if you know you're going to be using such a profiler.

[trofimander]

Thanks a lot for the quick and detailed answer! I'll try to supply FunctionMapper, althought it's not my library that uses JNA.

[twall]

Addressed in 3704b23