java python中的子进程调用以使用JAVA_OPTS调用java jar文件
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subprocess call in python to invoke java jar files with JAVA_OPTS
提问by user1164061
Example code:
示例代码：
import subprocess
subprocess.call(['java', '-jar', 'temp.jar'])
How to specify the JAVA_OPTS in the above command? I am getting a 'java.lang.OutOfMemoryError: unable to create new native thread' when I use the above command and I think specifying JAVA_OPTS in the command would solve the problem.
如何在上面的命令中指定JAVA_OPTS？当我使用上述命令时，出现“java.lang.OutOfMemoryError：无法创建新的本机线程”，我认为在命令中指定 JAVA_OPTS 可以解决问题。
I did specify the JAVA_OPTS in .bashrc file and it had no effect.
我确实在 .bashrc 文件中指定了 JAVA_OPTS 并且它没有效果。
回答by andrewdotn
You can do this, but finding how to do it in the documentation is kind of a wild goose chase.
你可以这样做，但在文档中找到如何做是一种疯狂的追逐。
The subprocess.call()documentationsays,
subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False)The arguments shown above are merely the most common ones, described below in Frequently Used Arguments(hence the slightly odd notation in the abbreviated signature).
subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False)上面显示的参数只是最常见的参数，在下面的常用参数中进行了描述（因此缩写签名中的符号略有奇怪）。
Then the Frequently Used Argumentssection, says, at the very end after describing a bunch of other arguments:
然后是常用参数部分，在描述了一堆其他参数后的最后说：
These options, along with all of the other options, are described in more detail in the
Popenconstructor documentation.
这些选项以及所有其他选项在
Popen构造函数文档中进行了更详细的描述。
Well then! The Popendocumentation gives the full signature:
好吧！该Popen文档提供了完整的签名：
class subprocess.Popen(args, bufsize=0, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=False, shell=False, cwd=None, env=None, universal_newlines=False, startupinfo=None, creationflags=0)
class subprocess.Popen(args, bufsize=0, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=False, shell=False, cwd=None, env=None, universal_newlines=False, startupinfo=None, creationflags=0)
envis the one you want! However, if you just pass env={'JAVA_OPTS': 'foo'}, then that will override allenvironment variables, including stuff like CLASSPATH, which could break other things. So you probably want to use code like this to add a JAVA_OPTSenvironment variable for the new process execution, without setting it in the current process:
env是你想要的！但是，如果您只是通过env={'JAVA_OPTS': 'foo'}，那么这将覆盖所有环境变量，包括诸如 之类的东西CLASSPATH，这可能会破坏其他东西。所以你可能想使用这样的代码JAVA_OPTS为新的流程执行添加一个环境变量，而不是在当前流程中设置它：
#!/usr/bin/env python2.7
import os
import subprocess
# Make a copy of the environment
env = dict(os.environ)
env['JAVA_OPTS'] = 'foo'
subprocess.call(['java', '-jar', 'temp.jar'], env=env)
回答by andersschuller
There is no need to use JAVA_OPTS - just pass in some more arguments to call(). For example:
无需使用 JAVA_OPTS - 只需将更多参数传递给call(). 例如：
import subprocess
subprocess.call(['java', '-jar', 'temp.jar', '-Xmx1024m', '-Xms256m'])
