在尝试设置断点时,我在Eclipse中得到这个奇怪的错误。

Unable to insert breakpoint Absent Line Number Information

我勾选了编译器选项的复选框,但运气不好。


当前回答

我从黑莓SDK方面得到了这个问题的答案:出于某种原因,无论我在编译器中修改了多少次选项,实际的底层设置文件都没有改变。

在项目的.settings文件夹中查找一个名为org.eclipse.jdt.core.prefs的文件。

在那里你可以手动修改设置:

org.eclipse.jdt.core.compiler.debug.lineNumber=generate

编辑:除此之外,我还注意到有时我可以忽略Eclipse给出的警告,它仍然会停在需要的地方……越来越奇怪……我将此归入我们作为开发人员所需要处理的事情中。

其他回答

对于使用Tomcat服务器的Web项目,我通过以下步骤解决了这个问题。

打开窗口->显示视图->其他->服务器。 双击运行中的tomcat服务器。(打开tomcat服务器概述) 现在点击启动配置链接。 单击sources选项卡。 单击Add。 选择java项目 将显示您的所有项目。 选择打开“您要调试。” 保存配置并重新启动或构建应用程序。

如果上述解决方案不起作用,并且你在做了spring bean注入后开始遇到这个问题,问题可能是你没有为注入类使用接口。尝试使用实现接口的类进行注入可以解决这个问题。下面是一个例子: 无法安装用于创建bean的断点问题

我也遇到过这个问题。我正在使用一个蚂蚁构建脚本。我正在开发一个遗留应用程序,所以我使用的是jdk版本1.4.2。这个方法曾经有用,所以我开始四处寻找。我注意到在JRE选项卡上的Debug配置下,Java的版本被设置为1.7。一旦我把它改回1.4,它就工作了。

我希望这能有所帮助。

这里有详细的解释:

https://github.com/spring-projects/spring-ide/issues/78

只是为了将来参考,这是答案的相关部分(忽略引用Spring Boot应用程序的事实,在许多其他情况下行为是相同的):

Whenever you set a breakpoint in Eclipse/STS, the IDE tries to set the breakpoint in the VM if you launch an app. That is what happens in your case when you run the boot app in debug mode. For each class that gets loaded into the JVM, the IDE checks whether it needs to set a breakpoint or not. If it decides to set the breakpoint, the tries to do so (using the information from the breakpoint definition in the IDE, including its line number, since you usually set line breakpoints on a source file at a given line). This decision (whether to set the breakpoint on a given loaded class or not) checks the types that you set the breakpoint on, enclosing types, and inner classes. This makes sure that breakpoints for inner classes (even anonymous inner classes) are set to the JVM (and are not ignored). Spring Boot generates an inner class for your controller at runtime (this is the CGLIB generated inner class that appears in the error message). When the JVM loads that class, it tries to set the line number breakpoint of the enclosing type (for this inner class). Since the generated inner class doesn't have any line number information (it doesn't need to have line number information), setting the breakpoint fails for this inner class with the mentioned error message. When the IDE loads the enclosing type (your controller class itself), it also tries to set the line breakpoint and succeeds with that. This is visualized with the check marker on the breakpoint marker. Therefore you can safely ignore the error message that shows up. To avoid this error message to show up, you can go to the preferences (Java -> Debug) and disable "Warn when unable to install breakpoint due to missing line number attributes".

我在一个特定的项目中遇到了同样的问题,我一直试图重置窗口中的行号属性->首选项…然后我意识到每个项目都有自己的行号属性设置。右键单击项目,进入属性,选择JavaCompiler,并选中“添加行号属性…”