对于Django下基于matlab的java程序，相同的cmd在shell中工作，但在subprocess.Popen（）中不工作_Java_Python_Django_Apache_Matlab

对于Django下基于matlab的java程序，相同的cmd在shell中工作，但在subprocess.Popen（）中不工作

java python django apache matlab

对于Django下基于matlab的java程序，相同的cmd在shell中工作，但在subprocess.Popen（）中不工作,java,python,django,apache,matlab,Java,Python,Django,Apache,Matlab,背景：Ubuntu 64位机器。我需要从django（部署在apache上）调用一个基于matlab的jar。问题是，当我在shell上运行命令时，它工作了；但是，当我在django代码中调用subprocess.Popen（{{cmd}}）时，会抛出一个异常。 Edit：我尝试打开一个python shell并调用subprocess.Popen（{{cmd}}）。我编写了一个python脚本文件，并将相同的代码放入其中。他们都工作。在django上运行时，代码就失败了，这真是太奇怪了有关详

背景：Ubuntu 64位机器。我需要从django（部署在apache上）调用一个基于matlab的jar。问题是，当我在shell上运行命令时，它工作了；但是，当我在django代码中调用

subprocess.Popen（{{cmd}}）

时，会抛出一个异常。
Edit：我尝试打开一个python shell并调用

subprocess.Popen（{{cmd}}）

。我编写了一个python脚本文件，并将相同的代码放入其中。他们都工作。在django上运行时，代码就失败了，这真是太奇怪了
有关详细信息：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

cmd:java-jar A.jar param1 param2 param3 param4
直接在shell中运行时，一切正常。使用python代码运行时，例外情况为：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

线程“main”java.lang.ExceptionInInitializeError中的异常位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir（MCRConfiguration.java:178）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get（MCRConfiguration.java:77）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.（MCRConfiguration.java:87）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot（MCRConfiguration.java:92）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.（MCRConfiguration.java:66）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir（MCRConfiguration.java:71）位于com.mathworks.toolbox.javabuilder.internal.MWMCR.（MWMCR.java:1466）位于autoBlockJava.AutoBlockJavaMCRFactory.newInstance（AutoBlockJavaMCRFactory.java:83）位于autoBlockJava.AutoBlockJavaMCRFactory.newInstance（AutoBlockJavaMCRFactory.java:94）在autoBlockJava.autoblockjavaSharedMCFactory$3.call（autoblockjavaSharedMCFactory.java:95）在autoBlockJava.autoblockjavaSharedMCFactory$3.call（autoblockjavaSharedMCFactory.java:93）位于autoBlockJava.autoblockjavasharedmcrfacture.getInstance（autoblockjavasharedmcrfacture.java:72）位于autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance（AutoBlockJavaSharedMCRFactory.java:93）在autoBlockJava.manualMain.（manualMain.java:97）位于autoblock.autoblock.main（autoblock.java:29）原因：java.lang.NullPointerException 位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get（MCRConfiguration.java:143）位于com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.（MCRConfiguration.java:173） ... 还有15个

我完全糊涂了。我现在真的不知道是什么原因

我认为您的问题与Python、Django或Java无关，而只与Matlab调用外部程序的方式有关

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

在Linux上，Matlab在子进程环境中设置变量

LD_LIBRARY_PATH

。例如，在我的系统上：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

>> getenv('LD_LIBRARY_PATH')

ans =

/opt/MATLAB/R2013a/sys/os/glnxa64:/opt/MATLAB/R2013a/bin/glnxa64:/opt/MATLAB/R2013a/extern/lib/glnxa64:/opt/MATLAB/R2013a/runtime/glnxa64:/opt/MATLAB/R2013a/sys/java/jre/glnxa64/jre/lib/amd64/native_threads:/opt/MATLAB/R2013a/sys/java/jre/glnxa64/jre/lib/amd64/server:/opt/MATLAB/R2013a/sys/java/jre/glnxa64/jre/lib/amd64

显然，此设置使某些系统库（或仅是正确版本的glibc？）对子进程不可用：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

>> !konsole
konsole: /opt/MATLAB/R2013a/sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/libstreamanalyzer.so.0)
konsole: /opt/MATLAB/R2013a/sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/libstreams.so.0)

可以通过以下方式显式取消设置

LD\u LIBRARY\u PATH

来解决此问题：

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

setenv('LD_LIBRARY_PATH')

我不确定Matlab设置的

LD_LIBRARY\u PATH

的目的是什么，我猜某些特殊功能必须通过取消设置来破坏。然而，我在我的

startup.m

中已经有了上面这句话很多年了，我没有遇到任何问题

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more

另请参见：

这似乎是环境变量的问题。验证

LD_LIBRARY_PATH

和

XAPPLRESDIR

是否可以通过

subprocess.Popen（…）

调用

echo$LD_LIBRARY_PATH

查看我的更新。从pythonshell调用程序和运行单个python脚本文件都可以。它在django下无法工作。我尝试在python代码中调用

echo$LD_LIBRARY_PATH

。如果我编写一个python文件并直接运行它，它将打印正确的路径。但是，当代码放入django时，它不会打印任何内容，这意味着它无法读取路径。这是我的假设。我对django的配置是WSGI和APACHE。从Matlab调用外部程序时经常出现问题，这些程序与

LD\u LIBRARY\u PATH

有关。在Matlab中执行

setenv（'LD\u LIBRARY\u PATH'）

通常可以解决这个问题。谢谢，通过在wsgi脚本中添加LD\u LIBRARY\u PATH，问题就解决了。

Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1466)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:83)
    at autoBlockJava.AutoBlockJavaMCRFactory.newInstance(AutoBlockJavaMCRFactory.java:94)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:95)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory$3.call(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.getInstance(AutoBlockJavaSharedMCRFactory.java:72)
    at autoBlockJava.AutoBlockJavaSharedMCRFactory.newInstance(AutoBlockJavaSharedMCRFactory.java:93)
    at autoBlockJava.manualMain.<init>(manualMain.java:97)
    at autoblock.AutoBlock.main(AutoBlock.java:29)
Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 15 more