Peter Radden created NIFI-6874:
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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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