JetBrains/intellij-community · error · EvaluateException

Invalid type name ''{0}''

Error message

Invalid type name ''{0}''

What it means

Error "Invalid type name ''{0}''" thrown in JetBrains/intellij-community.

Source

Thrown at java/debugger/impl/src/com/intellij/debugger/ui/impl/watch/DebuggerTreeNodeExpression.java:143

    }

    PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
    String typeName = type.getCanonicalText();
    try {
      PsiParenthesizedExpression parenthExpression = (PsiParenthesizedExpression)elementFactory.createExpressionFromText(
        "((" + typeName + ")expression)", null);
      //noinspection ConstantConditions
      ((PsiTypeCastExpression)parenthExpression.getExpression()).getOperand().replace(expression);
      Set<String> imports = expression.getUserData(ADDITIONAL_IMPORTS_KEY);
      if (imports == null) {
        imports = new HashSet<>();
      }
      imports.add(typeName);
      parenthExpression.putUserData(ADDITIONAL_IMPORTS_KEY, imports);
      return parenthExpression;
    }
    catch (IncorrectOperationException e) {
      throw new EvaluateException(JavaDebuggerBundle.message("error.invalid.type.name", typeName), e);
    }
  }

  /**
   * @param qualifiedName the class qualified name to be resolved against the current execution context
   * @return short name if the class could be resolved using short name,
   * otherwise returns qualifiedName
   */
  public static String normalize(final String qualifiedName, PsiElement contextElement, Project project) {
    if (contextElement == null) {
      return qualifiedName;
    }

    final JavaPsiFacade facade = JavaPsiFacade.getInstance(project);
    PsiClass aClass = facade.findClass(qualifiedName, GlobalSearchScope.allScope(project));
    if (aClass != null) {
      return normalizePsiClass(aClass, contextElement, facade.getResolveHelper());
    }

View on GitHub (pinned to be881553f2)

Solutions

1. Use a fully qualified, correctly spelled Java type name.
2. Ensure the class is on the debuggee's classpath.

Example fix

Use 'java.util.ArrayList' instead of 'Arraylist'.

When it happens

Trigger: A type name entered in a debugger expression cannot be resolved.

Common situations: Misspelled or non-qualified type names in Evaluate Expression or renderer configuration.

AI-assisted analysis of JetBrains/intellij-community@be881553f2 (2026-08-14). Data as JSON: /api/errors/a7b67426508fcb1d. Report an issue: GitHub.