Calling resolve on catch block parameter throws exception.

[tahiat]

The parsed java file is as below:

package com.examples.input;
public class Test1 {
    void test() {
        try{
            throw new CustomException("This is a custom Exception");
        } catch (CustomException e) {
            System.out.println(e.getMessage());
        }
    }
}

In ModifierVisitor, when trying to resolve the Parameter in method

@Override
 public Visitable visit(Parameter n, Void arg) {
        n.resolve();  // ---> exception thrown here
        return super.visit(n, arg);  
 }

an exception is thrown. Stack trace:

Exception in thread "main" java.lang.UnsupportedOperationException: Unable to find the declaration of type ResolvedParameterDeclaration from Parameter
	at com.github.javaparser.symbolsolver.JavaSymbolSolver.resolveDeclaration(JavaSymbolSolver.java:279)
	at com.github.javaparser.ast.body.Parameter.resolve(Parameter.java:322)
	at com.examples.input.ExceptionVisitor.visit(ExceptionVisitor.java:10)
	at com.examples.input.ExceptionVisitor.visit(ExceptionVisitor.java:7)
	at com.github.javaparser.ast.body.Parameter.accept(Parameter.java:114)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:210)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.stmt.CatchClause.accept(CatchClause.java:78)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:1133)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.NodeList.accept(NodeList.java:275)
	at com.github.javaparser.ast.visitor.ModifierVisitor.modifyList(ModifierVisitor.java:1172)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:951)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.stmt.TryStmt.accept(TryStmt.java:137)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:1133)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.NodeList.accept(NodeList.java:275)
	at com.github.javaparser.ast.visitor.ModifierVisitor.modifyList(ModifierVisitor.java:1172)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:171)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.stmt.BlockStmt.accept(BlockStmt.java:72)
	at com.github.javaparser.ast.visitor.ModifierVisitor.lambda$visit$60(ModifierVisitor.java:674)
	at java.base/java.util.Optional.map(Optional.java:260)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:674)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.body.MethodDeclaration.accept(MethodDeclaration.java:100)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:1133)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.NodeList.accept(NodeList.java:275)
	at com.github.javaparser.ast.visitor.ModifierVisitor.modifyList(ModifierVisitor.java:1172)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:246)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:97)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:1133)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:53)
	at com.github.javaparser.ast.NodeList.accept(NodeList.java:275)
	at com.github.javaparser.ast.visitor.ModifierVisitor.modifyList(ModifierVisitor.java:1172)
	at com.github.javaparser.ast.visitor.ModifierVisitor.visit(ModifierVisitor.java:310)
	at com.examples.input.TestExecutorClass.main(TestExecutorClass.java:31)

Since the CustomException class is a part of the source code, I believe that should be resolved successfully. Here is the reproducible sample repository

The resolve method here is causing the exception.

Interestingly, if I change the java file like below

package com.examples.input;
public class Test1 {
    void test(CustomException arg) {
        
    }
}

The CustomException arg is successfully resolved in the public Visitable visit(Parameter n, Void arg) method. This give me a sense that problem might be associated with the catch block parameter.

Please let me know I am doing it incorrectly. Any suggestions is appreciated.

[jlerbsc]

Thank you for reporting this anomaly. Indeed, parameter resolution is currently only carried out on methods and constructors.

Related to #3111