[jira] [Created] (NIFI-6874) nifi-nar-maven-plugin "Could not generate extensions' documentation" with native libraries

["Peter Radden (Jira)" <ji...@apache.org>]

Peter Radden created NIFI-6874:
----------------------------------

             Summary: nifi-nar-maven-plugin "Could not generate extensions' documentation" with native libraries
                 Key: NIFI-6874
                 URL: https://issues.apache.org/jira/browse/NIFI-6874
             Project: Apache NiFi
          Issue Type: Bug
          Components: Extensions, Tools and Build
    Affects Versions: nifi-nar-maven-plugin-1.3.1
            Reporter: Peter Radden


{code:java}
org.apache.maven.plugin.MojoExecutionException: Failed to create Extension Documentation
    at org.apache.nifi.NarMojo.generateDocumentation (NarMojo.java:596)
    at org.apache.nifi.NarMojo.execute (NarMojo.java:499)
    ...
Caused by: java.lang.UnsatisfiedLinkError: no [Library] in java.library.path
    at java.lang.ClassLoader.loadLibrary (ClassLoader.java:1867)
    at java.lang.Runtime.loadLibrary0 (Runtime.java:870)
    at java.lang.System.loadLibrary (System.java:1122)
    ...
    at org.apache.nifi.processor.AbstractSessionFactoryProcessor.initialize (AbstractSessionFactoryProcessor.java:63)
    at org.apache.nifi.documentation.AbstractDocumentationWriter.initialize (AbstractDocumentationWriter.java:86){code}
Custom processors that require native libraries for the implementation fail to generate documentation during nar build due to the need to initialize the processor.

While this could be resolved by a command line update to the java.library.path, I think that it would be better to extend the ExtensionClassLoader to attempt to find the libraries (similar to as done by the NarClassLoader.

My current temporary solution which uses a customized nifi-nar-maven-plugin is to add the following function to the ExtensionClassLoader:
{code:java}
protected String findLibrary(final String libname)
{
    final File nativeDir = new File(projectOutputDirectory/*from MavenProject*/, "META-INF/bundled-dependencies/native");
    final File libsoFile = new File(nativeDir, "lib" + libname + ".so");
    final File dllFile = new File(nativeDir, libname + ".dll");
    final File soFile = new File(nativeDir, libname + ".so");
    if (libsoFile.exists())
        return libsoFile.getAbsolutePath();
    else if (dllFile.exists())
        return dllFile.getAbsolutePath();
    else if (soFile.exists())
        return soFile.getAbsolutePath();
    return null;
}
{code}



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