无法将 eclipse 项目转换为 IJavaProject

2022-01-16 00:00:00 eclipse-plugin eclipse eclipse-jdt classcastexception

我有以下代码

    IJavaProject targetProject = null;
    IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
    for (IProject project : root.getProjects()) {
        if (project.getName().equals(projName)) {
            try {
                if (project.hasNature("org.eclipse.jdt.core.javanature")) {
                    targetProject = (IJavaProject) project;
                }
            } catch( ... ) {
             // etc ...
            }

我想要做的实际上是返回一个与特定名称匹配的项目作为 IJavaProject.如您所见，我通过以下方式检查以确保相关项目具有 java 特性:

What I am trying to do is essentially return a project that matches a particular name as an IJavaProject. As you can see, I check to ensure that the project in question has a java nature by calling:

if (project.hasNature("org.eclipse.jdt.core.javanature")) {

唉，我收到一个ClassCaseException"声明

Alas, I get a 'ClassCaseException' stating

java.lang.ClassCastException: 
    org.eclipse.core.internal.resources.Project cannot be cast to org.eclipse.jdt.core.IJavaProject

知道为什么吗?我会认为一旦 IProject 具有 Java 特性，它就可以转换为 IJavaProject.由于服务不可用，我目前无法访问 JDT Core API 这里.

Any idea why? I would have thought that once an IProject has a java nature, it can be cast to a IJavaProject. I can't get access to the JDT Core API at the moment as the service is unavailable here.

推荐答案

您答案中的代码不应该工作(错字?).以下是创建 IJavaProject 的方法:

The code in your answer shouldn't work (typo?). Here is how you can create an IJavaProject:

import org.eclipse.jdt.core.JavaCore
...
    if (project.hasNature(JavaCore.NATURE_ID)) {
        targetProject = JavaCore.create(project);
    }

IProject 是 Eclipse 资源 API 中的一种类型，而 IJavaProject 是 Eclipse Java 模型中的一种类型.它们不是相同的抽象，但所有 IJavaProject 都有一个 IProject.

IProject is a type in the Eclipse Resources API and IJavaProject is a type in the Eclipse Java Model. They are not the same abstractions, but all IJavaProjects have an IProject.

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