Error visiting method with type annotation

[eric-milles]

Guava's Iterables.getFirst has the following signature:

static <T> @Nullable T getFirst(Iterable<? extends T> iterable, @Nullable T defaultValue)

When visiting a line of code like this, an error is thrown:

import com.google.common.collect.Iterables
import com.google.common.collect.Multimap

Multimap<String, String> getParams() {
}
def parseString(String string) {
}
def str = parseString(Iterables.getFirst(params.get('key'), (String) null))

java.lang.IllegalArgumentException: @Nullable T
	at org.eclipse.jdt.core.Signature.createCharArrayTypeSignature(Signature.java:1100)
	at org.eclipse.jdt.core.Signature.createTypeSignature(Signature.java:1296)
	at org.eclipse.jdt.core.Signature.createTypeSignature(Signature.java:1324)
	at org.eclipse.jdt.groovy.core.util.GroovyUtils.getTypeSignatureWithoutGenerics(GroovyUtils.java:287)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.findElement(CodeSelectRequestor.java:751)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.findRequestedElement(CodeSelectRequestor.java:472)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.handleMatch(CodeSelectRequestor.java:252)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectRequestor.acceptASTNode(CodeSelectRequestor.java:136)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.handleRequestor(TypeInferencingVisitorWithRequestor.java:1843)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.handleSimpleExpression(TypeInferencingVisitorWithRequestor.java:1832)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstantExpression(TypeInferencingVisitorWithRequestor.java:963)
	at org.codehaus.groovy.ast.expr.ConstantExpression.visit(ConstantExpression.java:85)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitMethodCallExpression(TypeInferencingVisitorWithRequestor.java:1377)
	at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:70)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitListOfExpressions(CodeVisitorSupport.java:327)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitTupleExpression(CodeVisitorSupport.java:231)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitTupleExpression(TypeInferencingVisitorWithRequestor.java:1674)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitArgumentlistExpression(CodeVisitorSupport.java:338)
	at org.codehaus.groovy.ast.expr.ArgumentListExpression.visit(ArgumentListExpression.java:76)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitMethodCallExpression(TypeInferencingVisitorWithRequestor.java:1396)
	at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:70)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitBinaryExpression(TypeInferencingVisitorWithRequestor.java:750)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitDeclarationExpression(CodeVisitorSupport.java:298)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitDeclarationExpression(ClassCodeVisitorSupport.java:150)
	at org.codehaus.groovy.ast.expr.DeclarationExpression.visit(DeclarationExpression.java:89)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitExpressionStatement(CodeVisitorSupport.java:122)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitExpressionStatement(ClassCodeVisitorSupport.java:266)
	at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:42)
	at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:88)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:236)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitBlockStatement(TypeInferencingVisitorWithRequestor.java:822)
	at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:71)
	at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:145)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitConstructorOrMethod(TypeInferencingVisitorWithRequestor.java:1057)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitMethodInternal(TypeInferencingVisitorWithRequestor.java:621)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitJDT(TypeInferencingVisitorWithRequestor.java:459)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitJDT(TypeInferencingVisitorWithRequestor.java:350)
	at org.eclipse.jdt.groovy.search.TypeInferencingVisitorWithRequestor.visitCompilationUnit(TypeInferencingVisitorWithRequestor.java:256)
	at org.codehaus.groovy.eclipse.codebrowsing.requestor.CodeSelectHelper.select(CodeSelectHelper.java:84)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:506)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:499)
	at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.codeSelect(GroovyCompilationUnit.java:493)
	at org.eclipse.jdt.internal.ui.text.java.hover.AbstractJavaEditorTextHover.getJavaElementsAt(AbstractJavaEditorTextHover.java:124)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaSourceHover.getHoverInfo(JavaSourceHover.java:134)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaSourceHover.getHoverInfo2(JavaSourceHover.java:121)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:167)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:133)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:89)