Hi Guys my aim is to analyse an code the code might have a lot of methods and there might be more methods inside them and so on. I am trying to write a code which will give me a kind of heirarchy for the source class. I have used java parser to solve this requirement. But in the below code which i have come up with i keep getting Unresolved exception. This issue is only caused if the class contains an method which is taken from an user defined class but if i am using this on a code which only has java core methods i am not faced with errors.

public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        JavaSymbolSolver symbolSolver = new JavaSymbolSolver(new ReflectionTypeSolver(false));
        StaticJavaParser.getConfiguration().setSymbolResolver(symbolSolver);
        CompilationUnit cu = StaticJavaParser.parse(Files.newInputStream(Paths.get(FILE_PATH)));
        List<MethodDeclaration> methods = cu.findAll(MethodDeclaration.class);
        
        for(MethodDeclaration md : methods) {
            System.out.println("Methods: " + md.getNameAsString());
            List<MethodCallExpr> me = md.findAll(MethodCallExpr.class);
            for(MethodCallExpr expr : me) {
                String fullyQualifiedName = "";
                ResolvedMethodDeclaration resolvedMethod = expr.resolve();
                ResolvedTypeDeclaration declaringType = resolvedMethod.declaringType();
                String resolvedName = declaringType.getQualifiedName();
                
                if(expr.getScope().isPresent()) {
                    
                    fullyQualifiedName = expr.getScope().get().toString() + "." + expr.getNameAsString() + " : " + resolvedName;
                }
                else {
                    fullyQualifiedName =  expr.getNameAsString();
                }
                
                System.out.println("    |SubMethodNames: " + fullyQualifiedName);
            }
            
        }
    }

and below is the error:

Methods: main
Exception in thread "main" UnsolvedSymbolException{context='inventoryService.checkStock()', name='inventoryService', cause='UnsolvedSymbolException{context='null', name='InventoryService', cause='null'}'}
    at com.github.javaparser.symbolsolver.javaparsermodel.contexts.AbstractJavaParserContext.findTypeDeclarations(AbstractJavaParserContext.java:195)
    at com.github.javaparser.symbolsolver.javaparsermodel.contexts.MethodCallExprContext.solveMethod(MethodCallExprContext.java:150)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.solve(JavaParserFacade.java:273)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.solve(JavaParserFacade.java:134)
    at com.github.javaparser.symbolsolver.JavaSymbolSolver.resolveDeclaration(JavaSymbolSolver.java:172)
    at com.github.javaparser.ast.expr.MethodCallExpr.resolve(MethodCallExpr.java:319)
    at JavaParser.Parser.App.main(App.java:37)
Caused by: UnsolvedSymbolException{context='null', name='InventoryService', cause='null'}
    at com.github.javaparser.ast.type.ClassOrInterfaceType.convertToUsage(ClassOrInterfaceType.java:347)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convertToUsage(JavaParserFacade.java:599)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convert(JavaParserFacade.java:631)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.convert(JavaParserFacade.java:627)
    at com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserVariableDeclaration.getType(JavaParserVariableDeclaration.java:59)
    at com.github.javaparser.resolution.model.Value.from(Value.java:45)
    at com.github.javaparser.resolution.Context.solveSymbolAsValueInParentContext(Context.java:199)
    at com.github.javaparser.symbolsolver.javaparsermodel.contexts.MethodCallExprContext.solveSymbolAsValue(MethodCallExprContext.java:145)
    at com.github.javaparser.symbolsolver.resolution.SymbolSolver.solveSymbolAsValue(SymbolSolver.java:76)
    at com.github.javaparser.symbolsolver.resolution.SymbolSolver.solveSymbolAsValue(SymbolSolver.java:82)
    at com.github.javaparser.symbolsolver.javaparsermodel.TypeExtractor.visit(TypeExtractor.java:334)
    at com.github.javaparser.symbolsolver.javaparsermodel.TypeExtractor.visit(TypeExtractor.java:64)
    at com.github.javaparser.ast.expr.NameExpr.accept(NameExpr.java:81)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.getTypeConcrete(JavaParserFacade.java:493)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.getType(JavaParserFacade.java:364)
    at com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade.getType(JavaParserFacade.java:331)
    at com.github.javaparser.symbolsolver.javaparsermodel.contexts.AbstractJavaParserContext.findTypeDeclarations(AbstractJavaParserContext.java:186)
    ... 6 more

any support is appreciated thank you!

Aimed to get the method heirarchy but facing error.