Major Description
MBeansHandler.testDiff() has been failing regularly on Jenkins, e.g. https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20192/:
[junit4] 2> NOTE: reproduce with: ant test -Dtestcase=MBeansHandlerTest -Dtests.method=testDiff -Dtests.seed=CD7B1EB232DD9490 -Dtests.multiplier=3 -Dtests.slow=true -Dtests.locale=es-PA -Dtests.timezone=Asia/Phnom_Penh -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1 [junit4] ERROR 0.02s J0 | MBeansHandlerTest.testDiff <<< [junit4] > Throwable #1: java.lang.NullPointerException [junit4] > at __randomizedtesting.SeedInfo.seed([CD7B1EB232DD9490:86DDA29226BACF0]:0) [junit4] > at org.apache.solr.handler.admin.SolrInfoMBeanHandler.diffObject(SolrInfoMBeanHandler.java:240) [junit4] > at org.apache.solr.handler.admin.SolrInfoMBeanHandler.diffNamedList(SolrInfoMBeanHandler.java:219) [junit4] > at org.apache.solr.handler.admin.SolrInfoMBeanHandler.getDiff(SolrInfoMBeanHandler.java:187) [junit4] > at org.apache.solr.handler.admin.SolrInfoMBeanHandler.handleRequestBody(SolrInfoMBeanHandler.java:87) [junit4] > at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:177) [junit4] > at org.apache.solr.core.SolrCore.execute(SolrCore.java:2473) [junit4] > at org.apache.solr.util.TestHarness.query(TestHarness.java:337) [junit4] > at org.apache.solr.util.TestHarness.query(TestHarness.java:319) [junit4] > at org.apache.solr.handler.admin.MBeansHandlerTest.testDiff(MBeansHandlerTest.java:57) [junit4] > at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [junit4] > at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [junit4] > at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [junit4] > at java.base/java.lang.reflect.Method.invoke(Method.java:564) [junit4] > at java.base/java.lang.Thread.run(Thread.java:844)