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https://issues.apache.org/jira/browse/GROOVY-8267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440251#comment-16440251
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Eric Milles commented on GROOVY-8267:
-------------------------------------
I found the original source that caused this issue and was unable to reproduce
this error anymore. It was Groovy 2.4.12 at the time and now I have Groovy
2.4.15.
> NPE in StaticVerifier
> ---------------------
>
> Key: GROOVY-8267
> URL: https://issues.apache.org/jira/browse/GROOVY-8267
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.12
> Reporter: Eric Milles
> Priority: Major
>
> I am seeing this NPE due to one of our Groovy sources. When I replace the
> defaults below with additional constructors, the error subsides.
> {code}
> @CompileStatic
> class Foo implements Comparable<Foo> {
> Foo(String id = null, List<Bar> bars = Collections.EMPTY_LIST) { ... }
> }
> {code}
> {code}
> Caused by: java.lang.NullPointerException
> at
> org.codehaus.groovy.control.StaticVerifier$1.visitVariableExpression(StaticVerifier.java:96)
> at
> org.codehaus.groovy.ast.expr.VariableExpression.visit(VariableExpression.java:72)
> at
> org.codehaus.groovy.ast.CodeVisitorSupport.visitPropertyExpression(CodeVisitorSupport.java:254)
> at
> org.codehaus.groovy.ast.expr.PropertyExpression.visit(PropertyExpression.java:57)
> at
> org.codehaus.groovy.control.StaticVerifier.visitConstructorOrMethod(StaticVerifier.java:91)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructor(ClassCodeVisitorSupport.java:166)
> at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1197)
> at
> org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:56)
> at
> org.codehaus.groovy.control.StaticVerifier.visitClass(StaticVerifier.java:54)
> at
> org.codehaus.groovy.control.CompilationUnit$13.call(CompilationUnit.java:228)
> at
> org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1129)
> {code}
> Line 96 is the last line of:
> {code}
> @Override
> public void visitConstructorOrMethod(MethodNode node, boolean
> isConstructor) {
> MethodNode oldCurrentMethod = currentMethod;
> currentMethod = node;
> super.visitConstructorOrMethod(node, isConstructor);
> if (isConstructor) {
> final Set<String> exceptions = new HashSet<String>();
> for (final Parameter param : node.getParameters()) {
> exceptions.add(param.getName());
> if (param.hasInitialExpression()) {
> param.getInitialExpression().visit(new
> CodeVisitorSupport() {
> @Override
> public void
> visitVariableExpression(VariableExpression ve) {
> if (exceptions.contains(ve.getName())) return;
> Variable av = ve.getAccessedVariable();
> if (av instanceof DynamicVariable ||
> !av.isInStaticContext()) {
> {code}
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