错误：无法加载主类清单属性
当我在我的电脑上安装 mysql-connector-java-5.1.15-bin 时，它给我一个错误，例如：无法加载主类清单属性。请问您能告诉我应该做什么来消除这个错误吗？如果没有 mysql-connector-java-5.1.15-bin，我将无法执行任何操作，所以请尽快告诉我。
When I am installing mysql-connector-java-5.1.15-bin on my PC, it gives me an error such as: failed to load main-class manifest attribute from. Please can you tell me what should I do to remove this error? I'm not able to do anything without mysql-connector-java-5.1.15-bin, so please tell me as soon as possible.
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听起来您正在尝试运行 JAR 文件，就好像它是可执行 JAR 文件一样（通过双击它或使用
java -jar mysql-connector-...jar 等命令运行它代码>）。这不是您应该对这个 JAR 文件执行的操作。您只需要将其添加到项目的类路径中即可；不要尝试解压或运行它。它不包含安装程序。
背景信息：
可执行 JAR 文件包含一个
META-INF/MANIFEST文件，其中包含Main-Class等属性，这些属性告诉 Java 在运行 JAR 时要运行的类是什么文件。如果 JAR 文件不包含清单文件，或者包含不具有Main-Class属性的清单文件，则它不是可执行 JAR 文件。It sounds like you are trying to run the JAR file as if it is an executable JAR file (either by double-clicking on it or running it with a command like
java -jar mysql-connector-...jar).That's not what you are supposed to do with this JAR file. You just need to add it to the classpath of your project; don't try to unpack it or run it. It doesn't contain an installation program.
Background information:
Executable JAR files contain a
META-INF/MANIFESTfile that contains attributes such asMain-Classthat tell Java what the class to run is when you run the JAR file. If the JAR file doesn't contain a manifest file, or contains a manifest file that doesn't have aMain-Classattribute, then it is not an executable JAR file.出现两个问题：1）mysql-connector-java 应该有一个主类吗？ 2）你打算如何安装它？
1) 不。它只包含用于与 mysql 交互的 JDBC 类。
2）由于出现主类属性错误，您似乎双击了 jar 文件。
为了能够使用它，您必须将 jar 文件添加到您的类路径中。
Two questions come up: 1) Is mysql-connector-java supposed to have a main class? 2)how are you trying to install it?
1) No. It it only contains JDBC classes for interacting with mysql.
2) since you get main-class attribute errors you seem to be double clicking on a jar file.
To be able to use it you have to add the jar file to your classpath.