java.lang.VerifyError：使用 Spring Boot Data solr 时无法从 Final 类继承

Question

我有一个与 Spring Boot 1.4.2.RELEASE 一起运行的 REST Web 服务。我尝试在我的项目中使用 spring data solr，但出现了VerifyError。

Caused by: java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_40-ea]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[na:1.8.0_40-ea]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_40-ea]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) ~[na:1.8.0_40-ea]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_40-ea]
at java.net.URLClassLoader$1.run(URLClassLoader.java:367) ~[na:1.8.0_40-ea]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[na:1.8.0_40-ea]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_40-ea]
at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[na:1.8.0_40-ea]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_40-ea]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[na:1.8.0_40-ea]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_40-ea]
at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:158) ~[httpclient-4.5.2.jar:4.5.2]
at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:467) ~[httpclient-4.5.2.jar:4.5.2]
at org.apache.solr.client.solrj.impl.HttpClientUtil.setFollowRedirects(HttpClientUtil.java:290) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at org.apache.solr.client.solrj.impl.HttpClientConfigurer.configure(HttpClientConfigurer.java:58) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at org.apache.solr.client.solrj.impl.HttpClientUtil.configureClient(HttpClientUtil.java:149) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at org.apache.solr.client.solrj.impl.HttpClientUtil.createClient(HttpClientUtil.java:125) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:189) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:162) ~[solr-solrj-5.5.3.jar:5.5.3 8655b97b27d8da470c8235683af11a8b85a2b10f - anshum - 2016-09-01 13:05:41]
at com.itgis.kojaam.model.PersistenceContext.solrClient(PersistenceContext.java:157) ~[classes/:na]
at com.itgis.kojaam.model.PersistenceContext$$EnhancerBySpringCGLIB$$fa158d3c.CGLIB$solrClient$1(<generated>) ~[classes/:na]
at com.itgis.kojaam.model.PersistenceContext$$EnhancerBySpringCGLIB$$fa158d3c$$FastClassBySpringCGLIB$$fd7f382d.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at com.itgis.kojaam.model.PersistenceContext$$EnhancerBySpringCGLIB$$fa158d3c.solrClient(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40-ea]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40-ea]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40-ea]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_40-ea]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]

我认为这个错误与 solrj 与 spring 的库冲突有关，但我无法解决这个问题，我还删除了 maven 的缓存（.m2 文件夹）并再次重新导入依赖项，但不起作用，我的 pom.xml 文件如下所示：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.itgis</groupId>
<artifactId>myapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>MyApp</name>
<description>My Application</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>

    <!--Spring Boot-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <!--Spring REST-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web-services</artifactId>
    </dependency>

    <!--Spring Security-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <!--Spring JPA data-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <!--Protocol buffer-->
    <dependency>
        <groupId>com.google.protobuf</groupId>
        <artifactId>protobuf-java</artifactId>
        <version>3.0.0</version>
    </dependency>

    <dependency>
        <groupId>com.googlecode.protobuf-java-format</groupId>
        <artifactId>protobuf-java-format</artifactId>
        <version>1.3</version>
    </dependency>

    <!--MySQL Connector-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

    <!--Connection Pool library-->
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
    </dependency>

    <!-- Oval : Object validationUtil -->
    <dependency>
        <groupId>net.sf.oval</groupId>
        <artifactId>oval</artifactId>
        <version>1.86</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-solr</artifactId>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

这是我的 solr 配置：

    @Bean
public SolrClient solrClient() {
    return new HttpSolrClient(environment.getRequiredProperty(PROPERTY_NAME_SOLR_SERVER_URL));
}

请帮我解决这个错误，谢谢...

Answer 1

为此苦苦挣扎了2天：

Caused by: java.lang.VerifyError: Cannot inherit from final class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    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)

我的项目结构中有 5 个 Maven 子项目。

Parent Project
- ProjectA --> pom.xml (some-lib 2.0.2) --> some-lib-2.0.2.jar  -> *MyDep.class*
- ProjectB
- ProjectC --> pom.xml (other-name-lib 1.3.5) --> other-name-lib-1.3.5.jar -> *MyDep.class*
- ProjectD
- ProjectE

结果是两个子项目，导入了两个不同 jar 中存在的相同类。删除了 slimmer jar 依赖并修复了它。

我是怎么知道的？我反编译了所有依赖项（M2 中的本地 jar）以查找重复项。希望有更好的办法。

我的建议：这很可能是类路径中的重复项。梳理您的依赖项并查找重复项。所谓重复，我指的不仅仅是依赖项的 jar 名称，而是这些 jar 中的内容和类文件。