java.library.path，类路径 Netbeans 8.0.2

Question

我刚刚在以下位置安装了 Matlab Runtime:

Distributor ID: Ubuntu
Description:    Ubuntu 15.04
Release:    15.04
Codename:   vivid

您可以找到 Matlab 运行时 here在我的例子中，安装的 R2015b (9.0)*(MATLAB Runtime 9.0，用于 R2015b，旨在与 MATLAB 8.6 一起工作，它也是 R2015b)。

Matlab 库安装到:/usr/local/MATLAB

我正在使用 Netbeans 8.0.2

java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode) 

我的程序报错如下:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Failed to find the required library libmwmclmcrrt.so.9.0 on java.library.path.
This library is typically installed along with MATLAB or the MCR. Its absence may indicate an issue with that installation or the current path configuration.
The MCR version that this component is trying to use is: 9.0.

在安装 Matlab 时它确实说:

On the target computer, append the following to your LD_LIBRARY_PATH environment variable:  /usr/local/MATLAB/MATLAB_Runtime/v90/runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/sys/os/glnxa64:

我已将此行添加到项目 > 属性 > VM 选项:

-Djava.library.path="/usr/local/MATLAB/MATLAB_Runtime/v90/runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/sys/os/glnxa64:"

并且我使用“添加 JAR/文件夹”按钮将相同的文件夹添加到“项目”>“属性”>“库”。

我已将以下代码行放入我的程序中:

System.out.println(System.getProperty("java.library.path"));

我得到的输出正确为:

/usr/local/MATLAB/MATLAB_Runtime/v90/runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/sys/os/glnxa64:

但是，它仍然无法运行并出现相同的错误。

我安装了 IntelliJ IDEA 社区版，完全没有任何模组，代码运行没有任何问题。我真的很想继续使用 Netbeans 并想了解这个问题。有什么想法吗？

IntelliJ 加载了以下内容:

/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin/java 
-Didea.launcher.port=7532 
-Didea.launcher.bin.path=/home/code/idea-IC-143.1821.5/bin 
-Dfile.encoding=UTF-8 
-classpath /usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/cldrdata.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/dnsns.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/icedtea-sound.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/java-atk-wrapper.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/localedata.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/nashorn.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunec.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunjce_provider.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunpkcs11.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/zipfs.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jce.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jsse.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/management-agent.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/resources.jar
:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/rt.jar

:/home/code/NetBeansProjects/CO2model/out/production/TestModelABC
:/home/code/NetBeansProjects/CO2model/TestModelABC/dist/lib/co2model.jar
:/home/code/NetBeansProjects/CO2model/TestModelABC/dist/lib/javabuilder.jar
:/home/code/NetBeansProjects/CO2model/for_redistribution_files_only/co2model.jar
:/home/code/idea-IC-143.1821.5/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain test.Startup
.
:
:/usr/local/MATLAB/MATLAB_Runtime/v90/runtime/glnxa64
:/usr/local/MATLAB/MATLAB_Runtime/v90/bin/glnxa64
:/usr/local/MATLAB/MATLAB_Runtime/v90/sys/os/glnxa64
:
:/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni
:/lib/x86_64-linux-gnu
:/usr/lib/x86_64-linux-gnu
:/usr/lib/jni
:/lib
:/usr/lib

Answer 1

java.library.path 是java查找原生库的路径。如果

会报错

• 路径中没有名为libmwmclmcrrt.so的文件
• 文件libmwmclmcrrt.so的权限不正确

所以我的建议是使用名称 libmwmclmcrrt.so 运行搜索以了解该文件是否在系统中。如果找到，您可以手动将其复制粘贴到此路径

/usr/local/MATLAB/MATLAB_Runtime/v90/runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v90/sys/os/glnxa64

如果该路径中已经存在，也许您可​​以检查文件权限..

在大多数情况下，错误是因为找不到库..