如果编译时,报如下所示错误:
../../third-party/hadoop/lib/libhdfs.a(jni_helper.c.o): In function `getGlobalJNIEnv':
/root/hadoop-2.4.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:446: undefined reference to `JNI_GetCreatedJavaVMs'
/root/hadoop-2.4.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:505:
undefined reference to `JNI_CreateJavaVM'
/root/hadoop-2.4.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:505: undefined reference to `JNI_CreateJavaVM'
是因为链接时,没有加上库文件libjvm.so。加上libjvm.so重编译,如果又遇到如下所示的错误:
../../third-party/libjvm.so:
file not recognized: File format not recognized
这问题是因为libjvm.so不能被识别,libjvm.so的版本过高导致的
nm ../../third-party/libjvm.so | grep JNI_CreateJavaVM
nm: ../../third-party/libjvm.so: 不可识别的文件格式
查看nm的版本:
nm --version
GNU nm 2.16.91.0.5 20051219 (SUSE Linux)
Copyright 2005 Free Software Foundation, Inc.
本程序是自由软件;您可以按照 GNU 通用公共许可证
的条款对其进行再发行。本程序没有任何担保。
现在换成高一点的版本试试:
./nm --version
GNU nm 2.17.50.0.6-20.el5 20061020
Copyright 2005 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License. This program has absolutely no warranty.
再次执行,一切正常,需要升级
了,或者降低JRE或JDK的版本试试:
./nm libjvm.so | grep JNI_CreateJavaVM
00000000006307c0 T JNI_CreateJavaVM
实际应用中,编译虽然存在此问题,但运行时,可以使用更高版本的libjvm.so。
ld下载地址:(ld和nm均是GNU binutils的成员之一)。
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