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POFindClass in jni code crashes JVM
 

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  1. POFindClass in jni code crashes JVM
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    <p>I am trying to write a fairly basic JNI invocation from c++ code.</p> <pre><code>JavaVM *jvm; JNIEnv *env; JavaVMInitArgs vm_args; JavaVMOption options[2]; // Get the default initialization arguments and set the class // path. JNI_GetDefaultJavaVMInitArgs(&amp;vm_args); options[0].optionString = "-Djava.class.path=./hbase-1.0-SNAPSHOT.jar" options[1].optionString = "-verbose:jni"; vm_args.nOptions = 2; vm_args.version = JNI_VERSION_1_6; vm_args.options = options; // Load and initialize a Java VM, return a JNI interface // pointer in env. long result = JNI_CreateJavaVM(&amp;jvm, (void **)&amp;env, &amp;vm_args); if (result == JNI_ERR) { LOG(ERROR) &lt;&lt; "Failed to create a JVM"; return false; } jclass cls = env-&gt;FindClass("com/scaligent/falcon/hbase/HFileJniReader"); </code></pre> <p>My code crashes in FindClass. The strange thing is that I have a static block in the class and it prints the messages in the static block. I'm posting a few lines of error here. I cannot figure out how to debug or sovle this. </p> <pre><code>[Dynamic-linking native method java.lang.Package.getSystemPackage0 ... JNI] [Dynamic-linking native method java.util.jar.JarFile.getMetaInfEntryNames ... JNI] [Dynamic-linking native method java.lang.ClassLoader.defineClass1 ... JNI] [Dynamic-linking native method java.io.FileOutputStream.writeBytes ... JNI] Starting static block [Dynamic-linking native method java.util.zip.Inflater.getBytesWritten ... JNI] [Dynamic-linking native method sun.reflect.NativeMethodAccessorImpl.invoke0 ... JNI] [Dynamic-linking native method java.security.AccessController.doPrivileged ... JNI] [Dynamic-linking native method java.lang.Class.isAssignableFrom ... JNI] [Dynamic-linking native method java.lang.System.identityHashCode ... JNI] [Dynamic-linking native method java.util.zip.Inflater.end ... JNI] [Dynamic-linking native method java.util.zip.ZipFile.close ... JNI] [Dynamic-linking native method java.util.TimeZone.getSystemTimeZoneID ... JNI] [Dynamic-linking native method sun.nio.fs.UnixNativeDispatcher.init ... JNI] [Dynamic-linking native method sun.nio.fs.UnixNativeDispatcher.getcwd ... JNI] [Dynamic-linking native method sun.nio.fs.UnixNativeDispatcher.realpath0 ... JNI] [Dynamic-linking native method java.io.UnixFileSystem.getLength ... JNI] [Dynamic-linking native method java.util.ResourceBundle.getClassContext ... JNI] [Dynamic-linking native method sun.reflect.ConstantPool.getUTF8At0 ... JNI] [Dynamic-linking native method java.lang.reflect.Proxy.defineClass0 ... JNI] [Dynamic-linking native method java.lang.Class.isInstance ... JNI] 12/10/28 02:08:54 WARN conf.Configuration: fs.default.name is deprecated. Instead, use fs.defaultFS ending static block # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x000000000042f9e3, pid=7057, tid=140108980991808 # # JRE version: 7.0_04-b20 # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.0-b21 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [hfile_jni_reader_test+0x2f9e3] ftell@@GLIBC_2.2.5+0x2f9e3 # # Core dump written. Default location: /home/amit/git2/scaligent/falcon/hbase/core or core.7057 # # An error report file with more information is saved as: # /home/amit/git2/scaligent/falcon/hbase/hs_err_pid7057.log # # If you would like to submit a bug report, please visit: # http://bugreport.sun.com/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # </code></pre>
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    1. USAmit Prakash
    1. USAmit Prakash
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    1. COso did you find any solution for this ?
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    2. COit seems jni throws signals that normally it would catch but in gdb, it causes gdb to report crash. My code had other bugs that I was not able to catch because I was relying on gdb to debug.
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      1. USAmit Prakash
    3. CO@amit: do your C++ executable using the jar also use other 3rd party jar or other dependent jar in your java code base then u need to specify there path also, as per ur specification i can only find that problem.
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      1. USuser1808932
 

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