Tried to build the groovy3 branch but it failed in one of the groovydoc tasks:

> Task :grails-bootstrap:groovydoc FAILED
Exception in thread "main" java.lang.NoClassDefFoundError: com/github/javaparser/ast/visitor/VoidVisitorAdapter
        at java.base/java.lang.ClassLoader.defineClass1(Native Method)
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
        at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800)
        at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621)
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
        at org.codehaus.groovy.tools.groovydoc.antlr4.GroovyDocParser.parseJava(GroovyDocParser.java:67)
        at org.codehaus.groovy.tools.groovydoc.antlr4.GroovyDocParser.getClassDocsFromSingleSource(GroovyDocParser.java:57)
        at org.codehaus.groovy.tools.groovydoc.GroovyRootDocBuilder.processFile(GroovyRootDocBuilder.java:128)
        at org.codehaus.groovy.tools.groovydoc.GroovyRootDocBuilder.buildTree(GroovyRootDocBuilder.java:85)
        at org.codehaus.groovy.tools.groovydoc.GroovyDocTool.add(GroovyDocTool.java:79)
        at org.codehaus.groovy.tools.groovydoc.GroovyDocTool$add.call(Unknown Source)
        at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:139)
        at org.codehaus.groovy.tools.groovydoc.Main.execute(Main.groovy:216)
        at org.codehaus.groovy.tools.groovydoc.Main.main(Main.groovy:182)
Caused by: java.lang.ClassNotFoundException: com.github.javaparser.ast.visitor.VoidVisitorAdapter
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
        ... 20 more