“线程中的异常”；“主要”；java.lang.IllegalStateException:未找到此类型的数据。首先使用containsData检查是否存在此问题

我试图从java源代码中获取继承的方法和字段 但我有一个问题：

我试图从包含java源代码的文件中的每个类中找到继承的方法和字段，语法是正确的，但在执行程序时出现了一些错误

cu.accept(new VoidVisitorAdapter<Void>() {

        public void visit(ClassOrInterfaceDeclaration cid, Void arg) {
            super.visit(cid, arg);

            cid.resolve().getAllFields().stream().forEach(af -> {
                nmbre_attribus++;
            });

            cid.resolve().getDeclaredFields().stream().forEach(df -> {
                Nmbre_attributs_déclarées++;
            });

            cid.resolve().getAllMethods().stream().forEach(am -> {
                nmbre_methds++;
            });

            cid.resolve().getDeclaredMethods().stream().forEach(dm -> {
                Nmbre_methodes_déclarées++;
            });

        }

    }, null);

at com.github.javaparser.ast.Node.getData(Node.java:453)
at com.github.javaparser.ast.Node.lambda$7(Node.java:703)
at java.util.Optional.map(Unknown Source)
at com.github.javaparser.ast.Node.getSymbolResolver(Node.java:702)
at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.resolve(ClassOrInterfaceDeclaration.java:276)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:66)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:1)
at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:103)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.lambda$31(VoidVisitorAdapter.java:154)
at java.util.ArrayList.forEach(Unknown Source)
at com.github.javaparser.ast.NodeList.forEach(NodeList.java:268)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.visit(VoidVisitorAdapter.java:154)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:64)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:1)
at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:103)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.lambda$31(VoidVisitorAdapter.java:154)
at java.util.ArrayList.forEach(Unknown Source)
at com.github.javaparser.ast.NodeList.forEach(NodeList.java:268)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.visit(VoidVisitorAdapter.java:154)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:64)
at Metriques.Heritage_Attributs$1.visit(Heritage_Attributs.java:1)
at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:103)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.lambda$43(VoidVisitorAdapter.java:175)
at java.util.ArrayList.forEach(Unknown Source)
at com.github.javaparser.ast.NodeList.forEach(NodeList.java:268)
at com.github.javaparser.ast.visitor.VoidVisitorAdapter.visit(VoidVisitorAdapter.java:175)
at com.github.javaparser.ast.CompilationUnit.accept(CompilationUnit.java:130)
at Metriques.Heritage_Attributs.main(Heritage_Attributs.java:61)