2012-10-28 85 views
3

我想从C++代码编写一个相当基本的JNI调用。jni代码中的FindClass崩溃JVM

JavaVM *jvm; 
JNIEnv *env; 
JavaVMInitArgs vm_args; 
JavaVMOption options[2]; 

// Get the default initialization arguments and set the class 
// path. 
JNI_GetDefaultJavaVMInitArgs(&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(&jvm, (void **)&env, &vm_args); 
if (result == JNI_ERR) { 
    LOG(ERROR) << "Failed to create a JVM"; 
    return false; 
} 

jclass cls = env->FindClass("com/scaligent/falcon/hbase/HFileJniReader"); 

我的代码在FindClass中崩溃。奇怪的是,我在类中有一个静态块,它将消息打印在静态块中。我在这里发布了几行错误。 我无法弄清楚如何调试或解决这个问题。

[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] [email protected]@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. 
# 
+0

你是否找到了解决方案? – peeyush

+0

它似乎jni抛出通常它会捕获的信号,但在gdb中,它会导致gdb报告崩溃。我的代码有其他的错误,我无法捕捉,因为我依靠gdb进行调试。 –

+0

@amit:做你的C++可执行文件使用jar也可以在你的java代码库中使用其他第三方jar或其他依赖jar,然后你需要指定那里的路径,因为你的规范我只能找到这个问题。 – user1808932

回答

0

我后来意识到jni抛出的信号通常会捕获,但在gdb中,它会导致gdb报告崩溃。我的代码有其他非常普通的错误,我无法捕捉,因为我依靠gdb进行调试。

1

这可能是由于指针指向已被删除的对象。检查你的本地代码。

+0

不确定你的意思。在这个背景下的所有本地代码都存在于这个问题中。我在这里没有删除任何东西。 –

+0

已删除表示内存释放该对象。 –

+0

我明白:)我所说的是上面的本地代码不会释放任何东西。 –