Springブート - WebLogic 12cでServletRegistrationBeanを初期化できません

Question

WebLogic 12cでGraphQLサンプルJavaアプリケーションを実行していますが、起動時にサーブレットでエラーが発生しました。サーブレットが設定され、以下のようにServletRegistrationBeanを使用して私たちのサーブレットを登録した

：

@Configuration 
@ConditionalOnWebApplication 
@ConditionalOnClass(DispatcherServlet.class) 
@ConditionalOnBean({GraphQLSchema.class, GraphQLSchemaProvider.class}) 
@ConditionalOnProperty(value = "graphql.servlet.enabled", havingValue = "true", matchIfMissing = true) 
@AutoConfigureAfter({GraphQLJavaToolsAutoConfiguration.class, SpringGraphQLCommonAutoConfiguration.class}) 
@EnableConfigurationProperties(GraphQLServletProperties.class) 

public class GraphQLWebAutoConfiguration { 
    ... 
    @Bean 
    @ConditionalOnMissingBean 
    public GraphQLServlet graphQLServlet(GraphQLSchemaProvider schemaProvider, ExecutionStrategyProvider executionStrategyProvider) { 
     return new SimpleGraphQLServlet(schemaProvider, executionStrategyProvider, listeners, instrumentation, errorHandler, contextBuilder); 
    } 

    @Bean 
    ServletRegistrationBean graphQLServletRegistrationBean(GraphQLServlet servlet) { 
     ServletRegistrationBean bean = new ServletRegistrationBean(servlet, graphQLServletProperties.getServletMapping()); 
     bean.setLoadOnStartup(1); 
     return bean; 
    } 
} 

WebLogic Serverのログでは、エラーを出力します：

<Oct 2, 2017 1:51:28 PM SGT> <Error> <HTTP> <BEA-101125> <[ServletContext@933807824[app:CPRES module:CPRES path:null spec-version:3.1]] Error occurred while instantiating servlet: "simpleGraphQLServlet". 
java.lang.InstantiationException: graphql.servlet.SimpleGraphQLServlet 
     at java.lang.Class.newInstance(Class.java:427) 
     at weblogic.servlet.internal.WebComponentContributor.getNewInstance(WebComponentContributor.java:252) 
     at weblogic.servlet.internal.WebComponentContributor.getNewInstance(WebComponentContributor.java:245) 
     at weblogic.servlet.internal.WebComponentContributor.createServletInstance(WebComponentContributor.java:274) 
     at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.newServletInstanceIfNecessary(StubSecurityHelper.java:365) 
     Truncated. see log file for complete stacktrace 
Caused By: java.lang.NoSuchMethodException: graphql.servlet.SimpleGraphQLServlet.<init>() 
     at java.lang.Class.getConstructor0(Class.java:3082) 
     at java.lang.Class.newInstance(Class.java:412) 
     at weblogic.servlet.internal.WebComponentContributor.getNewInstance(WebComponentContributor.java:252) 
     at weblogic.servlet.internal.WebComponentContributor.getNewInstance(WebComponentContributor.java:245) 
     at weblogic.servlet.internal.WebComponentContributor.createServletInstance(WebComponentContributor.java:274) 
     Truncated. see log file for complete stacktrace 
> 
<Oct 2, 2017 1:51:28 PM SGT> <Error> <HTTP> <BEA-101216> <Servlet: "simpleGraphQLServlet" failed to preload on startup in Web application: "CPRES". 
javax.servlet.ServletException: Servlet class: 'graphql.servlet.SimpleGraphQLServlet' couldn't be instantiated 
     at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:326) 
     at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:294) 
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326) 
     at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:196) 
     at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203) 
     Truncated. see log file for complete stacktrace 
> 
<Oct 2, 2017 1:51:29 PM SGT> <Error> <Deployer> <BEA-149265> <Failure occurred in the execution of deployment request with ID "19094957742917053" for task "130" on [partition-name: DOMAIN]. Error is: "weblogic.application.ModuleException: javax.servlet.ServletException: Servlet class: 'graphql.servlet.SimpleGraphQLServlet' couldn't be instantiated" 
weblogic.application.ModuleException: javax.servlet.ServletException: Servlet class: 'graphql.servlet.SimpleGraphQLServlet' couldn't be instantiated 

それは、WebLogicがしようとしていることになりますSpringコンテキストによって作成および管理されるServletBean SimpleGraphQLServletの代わりに、新しいサーブレットインスタンスを作成します。

ありがとう。

Answer 1

walkaroundソリューションは、このようなサーブレットラッパークラスを記述することです：

public class DelegateGraphQLServlet extends HttpServlet { 
    protected GraphQLServlet graphQLServlet; 

    public void init(ServletConfig servletConfig) throws ServletException { 
     super.init(servletConfig); 

     ApplicationContext ac = (ApplicationContext) servletConfig.getServletContext().getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); 
     this.graphQLServlet = (GraphQLServlet)ac.getBean("graphQLServlet"); 
    } 

    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException { 
     graphQLServlet.service(req, res); 
    } 

}