您可以使用Shadow生成一个jar。

Shadow是一个Gradle插件，用于将项目的依赖类和资源组合到一个输出Jar中。组合罐通常被称为fat-jar或super - Jar。

Modify build.gradle plugins { ... // ① Add the shadow plugin id "com.github.johnrengelman.shadow" version "5.2.0" } ... // ② Config the shadow jar, its name is baseName-1.0-classifier.jar shadowJar { archiveBaseName.set('baseName') archiveClassifier.set('classifier') archiveVersion.set('1.0') manifest { attributes 'Main-Class': 'Main' } } // ③ Disable the default jar task jar.enabled = false // ④ Execute the shadowJar task when compiling build.dependsOn(shadowJar) Execute the command gradle build, the jar file will be generated: <Project Directory>/build/libs/baseName-1.0-classifier.jar

我也遇到过同样的问题，经过参考，它的工作原理如下:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.2.1</version>
    <configuration>
        <createDependencyReducedPom>false</createDependencyReducedPom>
    </configuration>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
        </execution>
    </executions>
</plugin>

假设您使用ant构建jar文件，您可以指示ant去掉META-INF目录。这是我的蚂蚁目标的简化版本:

<jar destfile="app.jar" basedir="${classes.dir}">
    <zipfileset excludes="META-INF/**/*" src="${lib.dir}/bcprov-jdk16-145.jar"></zipfileset>
    <manifest>
        <attribute name="Main-Class" value="app.Main"/>
    </manifest>
</jar>

我也遇到过类似的问题。原因是我使用的JDK的JRE与Windows系统中的默认JRE不同。

使用正确的java.exe解决了我的问题。

Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:314) at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:268) at java.util.jar.JarVerifier.processEntry(JarVerifier.java:316) at java.util.jar.JarVerifier.update(JarVerifier.java:228) at java.util.jar.JarFile.initializeVerifier(JarFile.java:383) at java.util.jar.JarFile.getInputStream(JarFile.java:450) at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:977) at sun.misc.Resource.cachedInputStream(Resource.java:77) at sun.misc.Resource.getByteBuffer(Resource.java:160) at java.net.URLClassLoader.defineClass(URLClassLoader.java:454) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)

帮助我的(IntelliJ IDEA 2016.3): 文件->项目结构-> Artifacts ->添加JAR ->选择主类->选择“通过manifest复制到输出目录和链接”->确定->应用->构建->构建Artifacts…- >构建

有可能是两个不同的签名者搞砸了java思维。

尝试从jar中删除META-INF文件夹，再次添加清单和签名jar，它帮助了我:http://jehy.ru/articles/2013/12/13/invalid-signature-file-digest-for-manifest-main-attributes/