The constructor BASE64Decoder() is not accessible due to restriction on required library

最新推荐文章于 2021-03-20 17:29:50 发布
原创 最新推荐文章于 2021-03-20 17:29:50 发布 · 1w 阅读 · 2 ·
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本文介绍了解决G4Studio开发环境中出现的BASE64Decoder构造限制错误的方法。通过调整项目构建路径设置，即移除并重新添加JRE System Library，可以有效解决此问题。
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搭建G4Studio的开发环境出现这个错误：

Description Resource Path Location Type Access restriction: The constructor BASE64Decoder() is not accessible due to restriction on required library D:\java\Tomcat6\jdk\jre\lib\rt.jar G4Utils.java /G4Studio/JavaCode/org/g4studio/core/util line 805 Java Problem

 

百度找到答案，只需要在project build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。

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你现在的错误非常关键： > **所有 Java 基础类都被限制访问！** > `String`、`Exception`、`JFrame`、`JLabel`、`UIManager` 等等全部报： > > ``` > Access restriction: The type XXX is not accessible due to restriction on required library rt.jar > ``` 这说明：你的项目 **无法访问 JDK 的核心类库（rt.jar）**，哪怕是最基本的 `String` 都不能用！ --- ## 🔥 根本原因 Eclipse 认为你引用的是一个“不完整”或“受限”的 JRE/JDK，导致它把 `rt.jar` 中的所有类都标记为 **不可访问**。 虽然你装了 JDK 1.8，但 Eclipse 可能以错误的方式加载了它 —— 比如把它当成了“外部库”而不是系统 JRE。 --- ## ✅ 终极解决方案（必须一步步操作） ### ✅ 第一步：彻底移除当前的 JRE 引用 1. 右键你的项目 → **Properties** 2. 左侧选择 **Java Build Path** 3. 中间标签页选 **Libraries** 4. 找到 `JRE System Library [JavaSE-1.8]` 或类似项 5. **选中它 → 点击右边的 Remove** 📌 此时你会发现 `src` 下的所有导入都变红了，没关系。 --- ### ✅ 第二步：重新添加标准 JRE（关键！） 1. 还在 **Java Build Path** 页面 2. 点击 **Add Library...** 3. 选择 **JRE System Library** → Next 4. 选择： ``` ☑ Standard Widget Toolkit (Standard) - Workspace default JRE (jdk1.8.0_xxx) ``` 5. 点击 **Finish** ✅ 这样才能确保你使用的是“标准可访问”的 JDK 环境 --- ### ✅ 第三步：检查是否还有 Access Rules 限制 展开刚刚添加的 `JRE System Library` → 找到 **Access rules** → 如果看到任何规则（尤其是 `access restrictive`），请做以下操作： #### 删除或修改 Access Rules： 1. 选中 **Access rules** → 点击 **Edit...** 2. 如果列表中有内容： - 选中每一行 → 点击 **Remove** 3. 然后点击 **Add...** - Rule kind: `resolution` - Matching rule: `**` 4. 点击 OK → Apply and Close > ⚠️ 必须有这一条，否则仍然会被拦截 --- ### ✅ 第四步：验证是否修复成功（最小测试代码） 将以下代码复制到 `MainApp.java`： ```java import javax.swing.*; import java.awt.*; public class MainApp { public static void main(String[] args) { JFrame frame = new JFrame("Hello"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 100); frame.setLocationRelativeTo(null); frame.add(new JLabel("Success!", SwingConstants.CENTER)); frame.setVisible(true); } } ``` 📌 注意：这次我们连 `UIManager` 都不用，只测试最基础的 Swing 能否运行。 --- ### ✅ 第五步：清理并运行 1. 菜单栏：**Project → Clean** → Clean your project 2. 保存文件（Ctrl + S） 3. 右键 `MainApp.java` → **Run As → Java Application** --- ## ✅ 成功标志 如果弹出一个窗口，中间写着 `"Success!"`，就说明： 🎉 所有类都能正常访问了！ ✅ `JFrame`、`JLabel`、`String`、`Exception` 全部恢复正常 ➡️ 你现在可以开始开发学生信息管理系统了！ --- ## ❌ 常见陷阱（避免再错） | 错误做法 | 正确做法 | |--------|---------| | 直接把 `rt.jar` 当外部 JAR 添加 | 使用 **Add Library → JRE System Library** | | 不检查 Access rules | 必须添加 `resolution **` 规则 | | 从别的项目复制 `.classpath` 文件 | 手动重建 Build Path 更安全 | --- ## 💡 补充建议 如果你以上步骤都做了还是不行，请尝试： ### 创建一个全新的 Java 项目： 1. **File → New → Java Project** 2. 输入项目名：`TestSwing` 3. 点击 **Next** → 切换到 **Libraries** 标签页 4. 点击 **Add Library** → 选择 **JRE System Library** → 完整添加 5. Finish 6. 新建类 `MainApp`，粘贴上面的成功代码 👉 很多时候旧项目的配置已经“中毒”，新建项目反而最快解决！ --- ## ✅ 总结：你现在要做的三件事 | 步骤 | 操作 | |------|------| | 1 | 移除现有 JRE，用 **Add Library → JRE System Library** 重新添加 | | 2 | 设置 Access Rules：添加 `resolution` + `**` | | 3 | 新建一个干净项目或清理旧项目，运行最小测试代码 | 只要这三步完成，你的程序一定能跑起来！ 如果还有问题，请告诉我： - Eclipse 版本（帮助 → About Eclipse） - JDK 是否是 32位？从哪下载的？ - 截图显示 Build Path 和 Access Rules 设置 我可以继续帮你远程诊断。
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