java.lang.NoClassDefFoundError：com / google / api / client / json / JsonFactory问题

Question

这是gradle依赖项。 （修订版）

   compile group: 'net.sf.ehcache', name: 'ehcache', version: '2.10.4'
compile 'org.springframework:spring-context-support:4.3.8.RELEASE'
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.6'

compile group: 'com.google.api-client', name: 'google-api-client', version: '1.20.0'

此代码生成错误。

   HttpTransport transport = new NetHttpTransport();
        JacksonFactory jsonFactory =
                new JacksonFactory();
        GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(
                transport, jsonFactory)
                .setAudience(Collections.singletonList("1009293319809-dek5gcam0af2c52ute611c8p51cfvker.apps.googleusercontent.com"))
                // Or, if multiple clients access the backend:
                //.setAudience(Arrays.asList(CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3))
                .build();

收到错误

Caused by: java.lang.NoClassDefFoundError: com/google/api/client/json/JsonFactory
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.getDeclaredMethods(Class.java:1975)
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:524)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:510)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:247)
... 63 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.google.api.client.json.JsonFactory
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
... 70 common frames omitted

知道我缺少什么库。我假设可能存在图书馆冲突。我该如何解决这个问题？

Answer 1

您的屏幕截图显示了google-api-client库的两个版本：

此外，您要在gradle构建文件中导入库两次：

compile group: 'com.google.api.client', name: 'google-api-client', version: '1.4.1-beta'
...
compile group: 'com.google.api-client', name: 'google-api-client', version: '1.20.0'

您获得java.lang.NoClassDefFoundError的事实似乎是由于旧版本的库不包含所提及的类并且它覆盖了最新版本的库这一事实。 您需要做的就是从gradle文件中删除对旧版本库（1.4.1-beta）的引用。