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>

如果你正在使用gradle，这里有一个完整的farJar任务:

version = '1.0'
//create a single Jar with all dependencies
task fatJar(type: Jar) {
    manifest {
        attributes 'Implementation-Title': 'Gradle Jar File Example',  
            'Implementation-Version': version,
            'Main-Class': 'com.example.main'
    }
    baseName = project.name + '-all'
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA' 
    with jar
}

对于那些使用gradle并试图创建和使用fat jar的人来说，下面的语法可能会有所帮助。

jar {
    doFirst {
        from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } } 
    }
    exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA' 
}

安全性已经是一个棘手的话题，但我很失望地看到最流行的解决方案是删除安全性签名。JCE需要这些签名。Maven阴影会爆炸将签名放入META-INF的BouncyCastle jar文件，但BouncyCastle签名对新的超级jar无效(仅对BC jar有效)，这就是导致此线程中出现无效签名错误的原因。

是的，排除或删除@ruhsuzbaykus所建议的签名确实可以消除最初的错误，但它也可能导致新的、神秘的错误:

java.security.NoSuchAlgorithmException: PBEWithSHA256And256BitAES-CBC-BC SecretKeyFactory not available

通过显式指定查找算法的位置，如下所示:

SecretKeyFactory.getInstance("PBEWithSHA256And256BitAES-CBC-BC","BC");

我得到了一个不同的错误:

java.security.NoSuchProviderException: JCE cannot authenticate the provider BC

JCE无法对提供者进行身份验证，因为我们已经按照同一线程中其他地方的建议删除了加密签名。

我找到的解决方案是可执行的封装器插件，它使用jar-in-jar的方法将BouncyCastle签名保存在单个可执行的jar中。

更新:

另一种方法(正确的方法?)是使用Maven Jar签名器。这允许您继续使用Maven shade而不会出现安全错误。但是，你必须有一个代码签名证书(Oracle建议搜索“Java代码签名证书”)。POM配置如下所示:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.1.0</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <filters>
                    <filter>
                        <artifact>org.bouncycastle:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
                <transformers>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <mainClass>your.class.here</mainClass>
                    </transformer>
                </transformers>
                <shadedArtifactAttached>true</shadedArtifactAttached>
            </configuration>
        </execution>
    </executions>
</plugin>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jarsigner-plugin</artifactId>
    <version>1.4</version>
    <executions>
        <execution>
            <id>sign</id>
            <goals>
                <goal>sign</goal>
            </goals>
        </execution>
        <execution>
            <id>verify</id>
            <goals>
                <goal>verify</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <keystore>/path/to/myKeystore</keystore>
        <alias>myfirstkey</alias>
        <storepass>111111</storepass>
        <keypass>111111</keypass>
    </configuration>
</plugin>

不，没有办法让JCE承认自签名的证书，所以如果你需要保留BouncyCastle证书，你必须使用jar-in-jar插件或获得JCE证书。

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

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