试图执行我的Java应用程序产生时libmysqlclient.so.18无法找到一个UnsatisfiedLinkError
例外,即使在LD_LIBRARY_PATH,-Djava.library.path和/etc/ld.so.conf中显式声明
我想利用pcap4j(https://github.com/kaitoy/pcap4j)的,对libpcap的Java包装,这样我就可以在Java应用程序嗅探我的机器NIFS包。由于libpcap的需要超级用户权限来执行这个任务,我必须以某种方式给执行这个应用程式的NIFS的能力的非特权用户。
pcap4j的维护者建议给予能力CAP_NET_RAW
和CAP_NET_ADMIN
到java命令如下:setcap cap_net_raw,cap_net_admin=eip /path/to/java
由于实施限制我的限制如下:
在java命令授予qazxsw POI和POI qazxsw能力后,问题出现了。在执行我的应用程序时,我收到以下异常:
CAP_NET_RAW
JAVA:JAVA-1.8.0-的OpenJDK,1.8.0.171-8
操作系统:Linux用户,我3.10.0-862.6.3.el7.x86_64#1 SMP周五6月15日17时57分37秒EDT 2018 x86_64的x86_64的x86_64的GNU / Linux的[红帽企业Linux服务器版本7.5(米埔)]
LD_LIBRARY_PATH包含对找不到库的显式路径:
CAP_NET_ADMIN
LD_LIBRARY_PATH被传递到JVM通过使用的java.library.path的:
Error creating entity
java.lang.UnsatisfiedLinkError: /path/to/app/lib/libxpherejava.so: libmysqlclient.so.18: cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1122)
的“-XshowSettings:属性”被执行java命令时为我提供了下面的输出:
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/lwp:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/jli/libjli.so:/usr/lib64/mysql/libmysqlclient.so.18
export LD_LIBRARY_PATH
其中exec java
-XshowSettings:properties
-Djava.library.path=${LD_LIBRARY_PATH}
-d64
...
是一个符号链接java.library.path =
/path/to/app/lib
/path/to/app/lib/glib-2.0
/usr/lib/lwp
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/jli/libjli.so
/usr/lib64/mysql/libmysqlclient.so.18
好像JVM(或其他实体请求从libxpherejava.so访问libmysqlclient.so.18)没有找到libmysqlclient.so.18,即使其路径明确提供给的java.library.path和文件确实存在。
用含有LD_LIBRARY_PATH路径libmysqlclient.so.18该libmysqlclient.so.18 libxpherejava.so产量(/usr/lib64/mysql/libmysqlclient.so.18),发行LDD无法找到
/usr/lib64/mysql/libmysqlclient.so.18
这是ld.so.conf中的内容:
/usr/lib64/mysql/libmysqlclient.so.18.0.0
这两个库是64位编译:
[user@user-me log]$ ldd /path/to/app/lib/libxpherejava.so
linux-vdso.so.1 => (0x00007ffe1a73d000)
libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007fd727df4000)
libssl.so.10 => /lib64/libssl.so.10 (0x00007fd727b83000)
libxphereS.so => /path/to/app/lib/libxphereS.so (0x00007fd727973000)
libmysqlclient.so.18 => not found
libz.so.1 => /lib64/libz.so.1 (0x00007fd72775d000)
libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fd727543000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fd727327000)
libm.so.6 => /lib64/libm.so.6 (0x00007fd727025000)
libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x00007fd726d11000)
libc.so.6 => /lib64/libc.so.6 (0x00007fd726944000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fd726740000)
libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007fd7264f3000)
libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007fd72620b000)
libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007fd726007000)
libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007fd725dd4000)
/lib64/ld-linux-x86-64.so.2 (0x00007fd728718000)
libpcre.so.1 => /lib64/libpcre.so.1 (0x00007fd725b72000)
libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007fd725964000)
libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007fd725760000)
libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fd725547000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fd725320000)
在执行了“EXEC Java”的命令,这个产量在脚本中使用strace - > [user@user-me lib]$ cat /etc/ld.so.conf
/path/to/app/lib/
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64/jre/lib/amd64/jli/libjli.so
/usr/lib64/mysql/libmysqlclient.so.18
[user@user-me lib]$ file libxpherejava.so
libxpherejava.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=82e1c673e732eb2d3770883b14facf3eff091243, not stripped
[user@user-me lib]$ file /usr/lib64/mysql/libmysqlclient.so.18
/usr/lib64/mysql/libmysqlclient.so.18: symbolic link to libmysqlclient.so.18.0.0'
[user@user-me lib]$ file /usr/lib64/mysql/libmysqlclient.so.18.0.0
/usr/lib64/mysql/libmysqlclient.so.18.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=79978c5f4fb259a5a146614e260ea0720dd31d3b, stripped
- >利布斯是64位和LD_LIBRARY_PATH明确地包含了路径问题的LIB有谁知道为什么libmysqlclient.so.18没有被发现?
创建符号链接到下https://github.com/kaitoy/pcap4j/issues/63有问题的库http://blog.tinola.com/?e=7解决了这个问题。唯一的例外是没有了。