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There is an import of java.lang.annotation.Annotation which should be org.jfree.chart.annotations.Annotation (it is imported just for Javadoc link). So trunk is not compilable with JDK 1.4. See attached patch.
I've tweaked the description since there are problem in trunk as well as in 1.0.x branch. Attaching patch for 1.0.x branch which makes it 1.4 compatible.
JDK 1.4 compatibility patch
The fix was applied in r2274.