请帮助您如何调试JNI应用程序。
使用jps获取正在运行jvm的进程的pid：
$ jps
8248 <- this is the pid of the process that was span up by a C++ application to run JNI stuff ...
8335 Jps
现在我们可以将gdb附加到此堆栈。
$ gdb -p 8248
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-94.el7
.... /cut/
(gdb)
(gdb) bt
#0 0x00007fddd9f141bd in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007fddd9f0fd02 in _L_lock_791 () from /lib64/libpthread.so.0
#2 0x00007fddd9f0fc08 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007fddda9f3e26 in mutexLock () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#4 0x00007fddda9ed6f1 in setTLSExceptionStrings () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#5 0x00007fddda9ec38c in printExceptionAndFreeV () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#6 0x00007fddda9ec52d in printExceptionAndFree () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#7 0x00007fddda9ed46b in getJNIEnv () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#8 0x00007fddda9eee94 in hdfsBuilderConnect () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#9 0x0000000000400950 in main ()
请注意，它悬挂在某种全局互斥锁中
我认为这个gdb回溯堆栈对于确定此问题的根本原因非常有用。
这应该是一个通用的JNI调试问题吗？如果您对此处感兴趣的是跨越JVM进行JNi交互的C代码 - https://gist.github.com/Tagar/7c42f82f5538004bda2f4ea0b0e0adc5
java版＆＃34; 1.8.0_141＆＃34; gcc版本4.8.5 20150623（Red Hat 4.8.5-11）（GCC）
运行时环境：
export LD_LIBRARY_PATH=$CDH/lib64:$JAVA_HOME/jre/lib/$OS_ARCH/server
export CLASSPATH=`hadoop classpath`
export _JAVA_OPTIONS=-Xss1280m
感谢任何线索。
此外，基于悬挂堆栈，它试图失败
#6 0x00007fddda9ec52d in printExceptionAndFree () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#7 0x00007fddda9ed46b in getJNIEnv () from /opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
但是在尝试时挂起 printExceptionAndFreeV（） - ＆gt; setTLSExceptionStrings（） - ＆gt; mutexLock（）锁..