PluginGotchas is an attempt to create a repository for identified problems which have been overcome through discussion on the Apache Nutch mailing lists.
Problem compiling custom plugins
Discussion on this issue can be seen in context here
When building a plugin with Ant E.g.
The following was logged to stdout
Buildfile: build.xml BUILD FAILED /home/moliere/java/apache-nutch-1.3/src/plugin/recommended/build.xml:5: The following error occurred while executing this line: /home/moliere/java/apache-nutch-1.3/src/plugin/build-plugin.xml:46: Problem: failed to create task or type antlib:org.apache.ivy.ant:settings Cause: The name is undefined. Action: Check the spelling. Action: Check that any custom tasks/types have been declared. Action: Check that any <presetdef>/<macrodef> declarations have taken place. No types or tasks have been defined in this namespace yet Total time: 0 seconds
The above error was solved by copying the jar file under /usr/share/lib/ant.