We're running GraphQL sample Java application in WebLogic 12c, but encountered some errors with servlet during startup.
我们在WebLogic 12c中运行GraphQL示例Java应用程序,但在启动期间遇到了一些servlet错误。
The servlet was configured and register our servlets using a ServletRegistrationBean as below:
配置servlet并使用ServletRegistrationBean注册我们的servlet,如下所示:
@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;
}
}
In the weblogic server log, it prints out errors:
在weblogic服务器日志中,它会输出错误:
<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
It looks that the weblogic is trying to create a new servlet instance instead of the ServletBean SimpleGraphQLServlet created and managed by Spring context.
看起来weblogic正在尝试创建一个新的servlet实例,而不是由Spring上下文创建和管理的ServletBean SimpleGraphQLServlet。
Any advance? Thanks.
任何进步?谢谢。
1 个解决方案
#1
0
A walkaround solution is to write a Servlet wrapper class like this:
一个简单的解决方案是编写一个这样的Servlet包装类:
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);
}
}
#1
0
A walkaround solution is to write a Servlet wrapper class like this:
一个简单的解决方案是编写一个这样的Servlet包装类:
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);
}
}