This error showed up on the ESB Validator tests last night:

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:0.15.0:compile (default-compile) on project org.jboss.tools.esb.validator: Compilation failure: Compilation failure:
[ERROR] /home/hudson/workspace/esb.bot.tests.ldimaggi/sources/plugins/org.jboss.tools.esb.validator/src/org/jboss/tools/esb/validator/ESBCoreValidator.java:[424,0]
[ERROR] public String getPreferencePageId() {
[ERROR] ^^^^^^^^^^^^^^^^^^^^^
[ERROR] The method getPreferencePageId() of type ESBCoreValidator.ESBPreferenceInfo must override a superclass method
[ERROR] /home/hudson/workspace/esb.bot.tests.ldimaggi/sources/plugins/org.jboss.tools.esb.validator/src/org/jboss/tools/esb/validator/ESBCoreValidator.java:[429,0]
[ERROR] public String getPropertyPageId() {
[ERROR] ^^^^^^^^^^^^^^^^^^^
[ERROR] The method getPropertyPageId() of type ESBCoreValidator.ESBPreferenceInfo must override a superclass method
[ERROR] /home/hudson/workspace/esb.bot.tests.ldimaggi/sources/plugins/org.jboss.tools.esb.validator/src/org/jboss/tools/esb/validator/ESBCoreValidator.java:[434,0]
[ERROR] public String getPluginId() {
[ERROR] ^^^^^^^^^^^^^
[ERROR] The method getPluginId() of type ESBCoreValidator.ESBPreferenceInfo must override a superclass method
[ERROR] 3 problems (3 errors)

See:
http://machydra.brq.redhat.com:8080/job/esb.bot.tests.ldimaggi/408/