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Asked: 2026-06-06T10:25:45+00:00

I’m trying to call a java program from python using command line. The code

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I’m trying to call a java program from python using command line. The code is as follows:

subprocess.check_output(["java", "pitt.search.semanticvectors.CompareTerms", "-queryvectorfile","termvectors.bin","term1","term2"])

I get the following error:

Error: Could not find or load main class pitt.search.semanticvectors.CompareTerms

This happens when I run the program from PyDev (version 2.5 in Eclipse 3.7.2). However, if I run the same code from the terminal, it works and I get the result I want.

I’m almost sure that the problem is related with some configuration of PyDev and how it handles the java CLASSPATH, which is:

/Users/feralvam/Programas/semanticvectors-3.4/semanticvectors-3.4.jar:/Users/feralvam/Programas/lucene-3.5.0/lucene-core-3.5.0.jar:/Users/feralvam/Programas/lucene-3.5.0/contrib/demo/lucene-demo-3.5.0.jar:

The class “pitt.search.semanticvectors.CompareTerms” is in “semanticvectors-3.4.jar”.

Any help you could give me would be really appreciated.

Thanks!

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1 Answer

  1. Editorial Team

    The solution proposed by @eis worked. Now, the command is:

    subprocess.check_output(["java", "-classpath", "/Users/feralvam/Programas/semanticvectors-3.4/semanticvectors-3.4.jar:/Users/feralvam/Programas/lucene-3.5.0/lucene-core-3.5.0.jar:/Users/feralvam/Programas/lucene-3.5.0/contrib/demo/lucene-demo-3.5.0.jar:", "pitt.search.semanticvectors.CompareTerms", "-queryvectorfile","/Users/feralvam/termvectors.bin","term1","term2"])
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