Description Tom Stamm 2005-04-01 15:20:59 EST

I'm getting an intermittant ClassCastException when I call resolveType() 
on an IType. It only happens occasionally, and I haven't been able to figure 
out what the cause is; but it seems to be internal to the JDT. I'm using 3.1M5.

I'm going through the AST primarily, because I need information about JDK5 
annotations; but in order to get the fully qualified type of a method 
argument, I'm getting the name of the type of the parameter, then passing 
that to resolveType on the IType of the primary type in the ICompilationUnit 
that I used to build the AST (by passing it to the ASTParser as the source). 
I prefer this to using resolveBindings on the AST because I've found that 
that getting bindings isn't very reliable if there are any source errors.


Essentially my code looks like this:

MethodDeclaration method; // the method I'm looking at
IType mainType; // the first type in the ICompilationUnit
...
// interested in the fourth param, already checked that it exists
SingleVariableDeclaration param = (SingleVariableDeclaration)params.get(3);
Type t = param.getType();
String typeName = ((SimpleType)t).getName().getFullyQualifiedName();
String[][] typeMatches = mainType.resolveType( typeName );


The code that it is looking at looks like this:

public class Controller extends PageFlowController {

    @Jpf.ExceptionHandler()
    protected Forward newExceptionHandler1(Exception ex, String actionName,
            String message, Object form)
    {
        getRequest().setAttribute("errorMessage", message);
        return new Forward("success");
    }
}


Right before getting the type, I have created the above method and its
annotations by using an ASTRewrite, and commiting the text edit to the
ICompilationUnit's buffer. Then I create a new AST, and use it, along with the
same ICompilationUnit, to try to resolve the type.

Most of the time this works, but occasionally I get a ClassCastException:

 java.lang.ClassCastException: 
org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference at 
org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.convertAnnotations(SourceTypeConverter.java:559)

at 
org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.convert(SourceTypeConverter.java:340)

at 
org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.convert(SourceTypeConverter.java:533)

at 
org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.convert(SourceTypeConverter.java:161)

at 
org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.buildCompilationUnit(SourceTypeConverter.java:106)

at 
org.eclipse.jdt.internal.codeassist.SelectionEngine.selectType(SelectionEngine.java:1096)

at org.eclipse.jdt.internal.core.SourceType.resolveType(SourceType.java:819) 
at org.eclipse.jdt.internal.core.SourceType.resolveType(SourceType.java:753) 
at com.bea.wlw.netui.core.util.ClassUtil.resolveType(ClassUtil.java:883) at
[ ... ]