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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Annotation ConcurrentModificationException during compilation","articleBody":"I have added a few more annotations to my project using the `org.scijava.annotations` tool and it now is throwing a strange `java.util.ConcurrentModificationException` during compilation. Has anyone seen this error before? Running a full clean on the project doesn't seem to alleviate the error.\n\n```\nError:scala: An annotation processor threw an uncaught exception.\nError:scala: Consult the following stack trace for details.\nError:scala: java.util.ConcurrentModificationException\nError:scala:    at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1207)\nError:scala:    at java.util.TreeMap$EntryIterator.next(TreeMap.java:1243)\nError:scala:    at java.util.TreeMap$EntryIterator.next(TreeMap.java:1238)\nError:scala:    at org.scijava.annotations.AbstractIndexWriter.write(AbstractIndexWriter.java:95)\nError:scala:    at org.scijava.annotations.AnnotationProcessor.process(AnnotationProcessor.java:91)\nError:scala:    at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)\nError:scala:    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)\nError:scala:    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)\nError:scala:    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)\nError:scala:    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)\nError:scala:    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)\nError:scala:    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)\nError:scala:    at com.sun.tools.javac.main.Main.compile(Main.java:523)\nError:scala:    at com.sun.tools.javac.main.Main.compile(Main.java:381)\nError:scala:    at com.sun.tools.javac.main.Main.compile(Main.java:370)\nError:scala:    at com.sun.tools.javac.main.Main.compile(Main.java:361)\nError:scala:    at com.sun.tools.javac.Main.compile(Main.java:56)\nError:scala:    at com.sun.tools.javac.Main.main(Main.java:42)\n```\n","author":{"url":"https://github.com/kmader","@type":"Person","name":"kmader"},"datePublished":"2014-12-04T21:25:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/136/scijava-common/issues/136"}