[SRU] Netbeans fails to create a java project with NoSuchMethodError

[Impact]
When trying to create a new Java project with Netbeans 10.0 the project is not created and an error is reported on netbeans log file and in netbeans' message report. The wizard window stays there with buttons disabled and can only be dismissed with the ESC button.

This affects netbeans 10.0 packages in all supported releases: bionic, cosmic, disco, and eoan.

~/.netbeans/10.0/var/log/messages.log:
<snip>
SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor org.openide.WizardDescriptor$Listener$2$1
java.lang.NoSuchMethodError: com.sun.tools.javadoc.main.JavadocClassFinder: method <init>(Lcom/sun/tools/javac/util/Context;)V not found
 at org.netbeans.lib.nbjavac.services.NBJavadocClassFinder.<init>(Unknown Source)
 at org.netbeans.lib.nbjavac.services.NBJavadocClassFinder$1.make(Unknown Source)
 at org.netbeans.lib.nbjavac.services.NBJavadocClassFinder$1.make(Unknown Source)
 at com.sun.tools.javac.util.Context.get(Context.java:150)
 at com.sun.tools.javac.code.ClassFinder.instance(ClassFinder.java:177)
 at com.sun.tools.javac.main.JavaCompiler.<init>(JavaCompiler.java:393)
 at org.netbeans.lib.nbjavac.services.NBJavaCompiler.<init>(Unknown Source)
 at org.netbeans.lib.nbjavac.services.NBJavaCompiler$1.make(Unknown Source)
 at org.netbeans.lib.nbjavac.services.NBJavaCompiler$1.make(Unknown Source)
 at com.sun.tools.javac.util.Context.get(Context.java:150)
 at com.sun.tools.javac.main.JavaCompiler.instance(JavaCompiler.java:112)
 at com.sun.tools.javac.model.JavacElements.<init>(JavacElements.java:105)
 at com.sun.tools.javac.model.JavacElements.instance(JavacElements.java:99)
 at com.sun.tools.javac.api.BasicJavacTask.getElements(BasicJavacTask.java:147)
 at org.netbeans.modules.java.source.parsing.CompilationInfoImpl.toPhase(Unknown Source)
 at org.netbeans.api.java.source.CompilationController.toPhase(Unknown Source)
 at org.netbeans.modules.java.source.JavaSourceUtilImpl$1.resolveModule(Unknown Source)
 at org.netbeans.modules.java.preprocessorbridge.api.ModuleUtilities.resolveModule(Unknown Source)
 at org.netbeans.modules.java.api.common.classpath.ModuleClassPaths$ModuleInfoClassPathImplementation.getResources(Unknown Source)
 at org.netbeans.api.java.classpath.ClassPath.entries(Unknown Source)
 at org.netbeans.spi.java.classpath.support.MuxClassPathImplementation.getResources(Unknown Source)
 at org.netbeans.api.java.classpath.ClassPath$SPIListener.propertyChange(Unknown Source)
 at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(Unknown Source)
 at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:266)
 at org.netbeans.spi.java.classpath.support.MuxClassPathImplementation.propertyChange(Unknown Source)
 at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(Unknown Source)
 at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:266)
 at org.netbeans.modules.java.api.common.classpath.ClassPathProviderImpl$SourceLevelSelector.propertyChange(Unknown Source)
 at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(Unknown Source)
 at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
 at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
 at org.netbeans.spi.project.support.ant.SequentialPropertyEvaluator.stateChanged(Unknown Source)
 at org.openide.util.WeakListenerImpl$Change.stateChanged(Unknown Source)
 at org.openide.util.ChangeSupport.fireChange(Unknown Source)
 at org.openide.util.ChangeSupport.fireChange(Unknown Source)
 at org.netbeans.spi.project.support.ant.ProjectProperties$PP$2.run(Unknown Source)
 at org.netbeans.spi.project.support.ant.ProjectProperties$PP$2.run(Unknown Source)
 at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(Unknown Source)
 at org.openide.util.Mutex.readAccess(Unknown Source)
 at org.netbeans.spi.project.support.ant.ProjectProperties$PP.fireChange(Unknown Source)
 at org.netbeans.spi.project.support.ant.ProjectProperties$PP.put(Unknown Source)
 at org.netbeans.spi.project.support.ant.ProjectProperties.putProperties(Unknown Source)
 at org.netbeans.spi.project.support.ant.AntProjectHelper$6.run(Unknown Source)
 at org.netbeans.spi.project.support.ant.AntProjectHelper$6.run(Unknown Source)
 at org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(Unknown Source)
 at org.openide.util.Mutex.writeAccess(Unknown Source)
 at org.netbeans.spi.project.support.ant.AntProjectHelper.putProperties(Unknown Source)
 at org.netbeans.modules.java.j2seproject.api.J2SEProjectBuilder.createProject(Unknown Source)
 at org.netbeans.modules.java.j2seproject.api.J2SEProjectBuilder.lambda$build$0(Unknown Source)
 at org.openide.filesystems.EventControl.runAtomicAction(Unknown Source)
 at org.openide.filesystems.FileSystem.runAtomicAction(Unknown Source)
 at org.netbeans.modules.java.j2seproject.api.J2SEProjectBuilder.build(Unknown Source)
 at org.netbeans.modules.java.j2seproject.J2SEProjectGenerator.createProject(Unknown Source)
 at org.netbeans.modules.java.j2seproject.ui.wizards.NewJ2SEProjectWizardIterator.instantiate(Unknown Source)
 at org.openide.loaders.TemplateWizard$InstantiatingIteratorBridge.instantiate(Unknown Source)
 at org.openide.loaders.TemplateWizard.handleInstantiate(Unknown Source)
 at org.netbeans.modules.project.ui.NewProjectWizard.handleInstantiate(Unknown Source)
 at org.openide.loaders.TemplateWizard.instantiateNewObjects(Unknown Source)
 at org.openide.loaders.TemplateWizardIterImpl.instantiate(Unknown Source)
 at org.openide.loaders.TemplateWizardIteratorWrapper$ProgressInstantiatingIterator.instantiate(Unknown Source)
 at org.openide.WizardDescriptor.callInstantiateOpen(Unknown Source)
 at org.openide.WizardDescriptor.callInstantiate(Unknown Source)
 at org.openide.WizardDescriptor.access$2300(Unknown Source)
 at org.openide.WizardDescriptor$Listener$2$1.run(Unknown Source)
 at org.openide.util.RequestProcessor$Task.run(Unknown Source)
 at org.netbeans.modules.openide.util.GlobalLookup.execute(Unknown Source)
[catch] at org.openide.util.lookup.Lookups.executeWith(Unknown Source)
 at org.openide.util.RequestProcessor$Processor.run(Unknown Source)

[Test Case]

 1. In Netbeans, click "File" -> "New Project"
 2. Select "Java" -> "Java Application"
 3. Click "Next >" and then "Finish"
 4. A new Java Project should have been created

Without the fix step #4 is:

 4. Observe that the Wizard will have all buttons but "Help"
    disabled and that the Notifications tab contains a
    "Unexpected Exception" message in it. The netbeans log
    file at ~/.netbeans/10.0/var/log/messages.log also
    contains an error report with the full exception.

[Regression Potential]

 * The backported patch is 1.8k lines long and touches a few APIs, so it could introduce new bugs on untested code paths. It has not yet make into Netbeans 11 or 10, so tracking upstream bugs regarding this patch could be somewhat hard. Still, it is needed to get Netbeans working.