I get the following output and at the end I get "javadoc: error - No public or protected classes found to document."
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
!SESSION 2013-06-30 21:21:45.765 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.7.0_15
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.947
!MESSAGE NLS missing message: INDEX_FOUND in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.948
!MESSAGE NLS missing message: INDEX_NOT_FOUND in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.948
!MESSAGE NLS missing message: SCANNING_BEGIN in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.948
!MESSAGE NLS missing message: SCANNING_END in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.949
!MESSAGE NLS missing message: SCANNING_RESULTS in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.949
!MESSAGE NLS missing message: SCANNING_ARTIFACT_FOUND in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.949
!MESSAGE NLS missing message: SCANNING_ARTIFACT_FAILED in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.949
!MESSAGE NLS missing message: SCANNING_ARTIFACT_EXCEPTION in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.950
!MESSAGE NLS missing message: CREATING_NEW_INDEX in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.950
!MESSAGE NLS missing message: UPDATING_INDEX in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.950
!MESSAGE NLS missing message: WRITING_INDEX_MONITOR in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.950
!MESSAGE NLS missing message: LIST_ARTIFACTS_FAILED_EXCEPTION in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.951
!MESSAGE NLS missing message: DOWNLOADING_RESOURCE in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.951
!MESSAGE NLS missing message: DOWNLOADED_RESOURCE in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.951
!MESSAGE NLS missing message: FULL_INDEX_DOWNLOAD in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.952
!MESSAGE NLS missing message: INDEX_UP_TO_DATE in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.952
!MESSAGE NLS missing message: PARTIAL_INDEX_DOWNLOAD in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.952
!MESSAGE NLS missing message: FETCH_LIST_BEGIN in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.953
!MESSAGE NLS missing message: ARTIFACT_ADDED_TO_LIST in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.953
!MESSAGE NLS missing message: INITIALIZE_INDEXING_CONTEXT_SUCCESS in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.953
!MESSAGE NLS missing message: INITIALIZE_INDEXING_CONTEXT_FAILURE in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.954
!MESSAGE NLS missing message: CREATING_DEPENDENTS_INDEX_BEGIN in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.954
!MESSAGE NLS missing message: CREATING_DEPENDENTS_INDEX_END in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.955
!MESSAGE NLS missing message: COLLECTING_CLASSPATH_DEPENDENCIES in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.955
!MESSAGE NLS missing message: RESOLVING_CLASSPATH_DEPENDENCIES in: com.codetrails.internal.repo.l10n.messages
!ENTRY org.eclipse.osgi 2 1 2013-06-30 21:21:46.956
!MESSAGE NLS missing message: LISTING_DIRECT_DEPENDENCIES in: com.codetrails.internal.repo.l10n.messages
Constructing Javadoc information...
javadoc: error - No public or protected classes found to document.
[done in 136 ms]
1 error
Done.
codetrails-1:MacOS marcel$