We've traditionally used the individual plugins (PMD, Findbugs) but came across this when one of our projects moved from Findbugs to Spotbugs.  We really like how the report looks and we're keen to use it in place of the older plugins...

I've run into some trouble using the Findbugs option on the new plugin.  When I try to collect findbugs information I get this:
[FindBugs] [ERROR] Parsing of file 'xxxxx' failed due to an exception:

org.dom4j.DocumentException: Sax error Nested exception: SAX2 driver class org.apache.xerces.parsers.SAXParser not found
at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:391)
at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:368)
at edu.umd.cs.findbugs.SortedBugCollection.readXML(SortedBugCollection.java:355)
at edu.hm.hafner.analysis.parser.FindBugsParser.readXml(FindBugsParser.java:230)
at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:175)
at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:111)
at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:97)
at edu.hm.hafner.analysis.IssueParser.parse(IssueParser.java:70)
at io.jenkins.plugins.analysis.core.util.FilesScanner.aggregateIssuesOfFile(FilesScanner.java:101)
at io.jenkins.plugins.analysis.core.util.FilesScanner.scanFiles(FilesScanner.java:85)
at io.jenkins.plugins.analysis.core.util.FilesScanner.invoke(FilesScanner.java:68)
at io.jenkins.plugins.analysis.core.util.FilesScanner.invoke(FilesScanner.java:29)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3085)
at hudson.remoting.UserRequest.perform(UserRequest.java:212)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found
 

The strange part is if I copy the findbugs xml files to a different job I don't get the error.  The plugin does complain about not being able to find the source but it still process the data and gives me a nice report.  I guess the issue is being triggered when the plugin attempts to parse through the source code.

just an addition here.  I'm seeing the same issue when I try and use spotbugs...  I know that isn't a surprise, but I thought I'd post it.
[SpotBugs] [ERROR] Parsing of file '...' failed due to an exception: 14:41:22 14:41:22 org.dom4j.DocumentException: Sax error Nested exception: SAX2 driver class org.apache.xerces.parsers.SAXParser not found*14:41:22* at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:391)14:41:22 at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:368)14:41:22 at edu.umd.cs.findbugs.SortedBugCollection.readXML(SortedBugCollection.java:355)14:41:22 at edu.hm.hafner.analysis.parser.FindBugsParser.readXml(FindBugsParser.java:230)14:41:22 at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:175)14:41:22 at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:111)14:41:22 at edu.hm.hafner.analysis.parser.FindBugsParser.parse(FindBugsParser.java:97)14:41:22 at edu.hm.hafner.analysis.IssueParser.parse(IssueParser.java:70)14:41:22 at io.jenkins.plugins.analysis.core.util.FilesScanner.aggregateIssuesOfFile(FilesScanner.java:101)14:41:22 at io.jenkins.plugins.analysis.core.util.FilesScanner.scanFiles(FilesScanner.java:85)14:41:22 at io.jenkins.plugins.analysis.core.util.FilesScanner.invoke(FilesScanner.java:68)14:41:22 at io.jenkins.plugins.analysis.core.util.FilesScanner.invoke(FilesScanner.java:29)14:41:22 at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3085)14:41:22 at hudson.remoting.UserRequest.perform(UserRequest.java:212)14:41:22 at hudson.remoting.UserRequest.perform(UserRequest.java:54)14:41:22 at hudson.remoting.Request$2.run(Request.java:369)14:41:22 at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)14:41:22 at java.util.concurrent.FutureTask.run(FutureTask.java:266)14:41:22 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)14:41:22 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)14:41:22 at java.lang.Thread.run(Thread.java:748)14:41:22 Caused by: org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found*14:41:22* java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser*14:41:22* at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:230)14:41:22 at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:191)14:41:22 at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:388)14:41:22 ... 20 more