weblogic 服务器上的 Vaadin applicationContext 空指针错误
Vaadin applicationContext nullpointer error on weblogic server
我的 vaadin 应用程序有问题。该项目在我的本地 tomcat 服务器上成功运行。当我在 weblogic 服务器中部署它时，出现如下错误。我该如何解决这个问题？
此外，我还有一些用于简单用户指南的嵌入式资源（图像文件）。
DBDefaultValues.java:
private static void addDefaultCompany() {
ICompanyService companyService =
UtilsForSpring.getSingleBeanOfType(ICompanyService.class); //line:34
if (companyService.getCompanies().size() == 0) {
Company company = new Company();
company.setCompanyName("MyComapny");
companyService.save(company);
}
}
UtilsForSpring.java:
@Component
public class UtilsForSpring implements ApplicationContextAware {
private static ApplicationContext context;
public static <T> T getSingleBeanOfType(Class<T> beanClass) {
return context.getBeansOfType(beanClass).values().iterator().next();
}
@Override
public void setApplicationContext(ApplicationContext context) throws BeansException {
UtilsForSpring.context = context;
}
}
config.xml 文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<context:component-scan base-package="com.myproject.vaadinapp"/>
<context:annotation-config/>
<context:property-placeholder location="classpath:/hibernate.properties"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<mvc:annotation-driven/>
<task:annotation-driven/>
<bean id="clearReservedPstnBbk" class="com.myproject.vaadinapp.MainUI"></bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.SingleConnectionDataSource">
<property name="driverClassName" value="${db.driverClassName}"></property>
<property name="url" value="${db.url}"></property>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="suppressClose" value="true"/>
</bean>
<bean id="hibernateCfgProperties"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="properties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.use_sql_comments">true</prop>
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
<prop key="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>
<prop key="hibernate.c3p0.testConnectionOnCheckout">true</prop>
<prop key="hibernate.c3p0.timeout">1800</prop>
<prop key="hibernate.c3p0.maxIdleTimeExcessConnections">20</prop>
<prop key="hibernate.c3p0.validate">false</prop>
<prop key="hibernate.c3p0.idle_test_period">30</prop>
<prop key="hibernate.c3p0.automaticTestTable">conTestTable</prop>
</props>
</property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties" ref="hibernateCfgProperties"/>
<property name="packagesToScan" value="com.myproject.vaadinapp.model"/>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</beans>
这里有错误：
]] Root cause of ServletException.
com.vaadin.server.ServiceException: java.lang.NullPointerException
at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1474)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1434)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.websocket.tyrus.TyrusServletFilter.doFilter(TyrusServletFilter.java:205)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
Caused By: java.lang.NullPointerException
at net.egemsoft.ahenk.utils.UtilsForSpring.getSingleBeanOfType(UtilsForSpring.java:17)
at net.egemsoft.ahenk.utils.DBDefaultValues.addDefaultCompany(DBDefaultValues.java:34)
at net.egemsoft.ahenk.utils.DBDefaultValues.initialize(DBDefaultValues.java:25)
at net.egemsoft.ahenk.MainUI.init(MainUI.java:83)
at com.vaadin.ui.UI.doInit(UI.java:698)
at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:214)
at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.websocket.tyrus.TyrusServletFilter.doFilter(TyrusServletFilter.java:205)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
>
很可能，您的 DBDefaultValues bean 是在 UtilsForSpring 之前构建的。你需要强制执行此操作。
更改您的 config.xml 以便 spring 将首先构建您的实用程序 bean。像这样：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<bean class="path.to.UtilsForSpring" />
<context:component-scan base-package="com.myproject.vaadinapp"/>
您可以像以前一样继续使用注释。
如果上述方法有效，那么您可以继续在 addDefaultCompany 方法上使用 @DependsOn 批注，并从 config.xml.
中删除新添加的 bean 定义
@DependsOn(value = "utilsForSpring")
private static void addDefaultCompany() {
ICompanyService companyService =
UtilsForSpring.getSingleBeanOfType(ICompanyService.class); //line:34
if (companyService.getCompanies().size() == 0) {
Company company = new Company();
company.setCompanyName("MyComapny");
companyService.save(company);
}
}
我解决了问题！原因是我习惯了一个 Vaadin 附加组件。我尝试了所有版本的附加组件，但它无法与 weblogic server 12.1.3 一起正常工作
<dependency>
<groupId>org.vaadin.addon</groupId>
<artifactId>jfreechartwrapper</artifactId>
<version>3.0.0</version>
</dependency>
我的 vaadin 应用程序有问题。该项目在我的本地 tomcat 服务器上成功运行。当我在 weblogic 服务器中部署它时，出现如下错误。我该如何解决这个问题？
此外，我还有一些用于简单用户指南的嵌入式资源（图像文件）。
DBDefaultValues.java:
private static void addDefaultCompany() {
ICompanyService companyService =
UtilsForSpring.getSingleBeanOfType(ICompanyService.class); //line:34
if (companyService.getCompanies().size() == 0) {
Company company = new Company();
company.setCompanyName("MyComapny");
companyService.save(company);
}
}
UtilsForSpring.java:
@Component
public class UtilsForSpring implements ApplicationContextAware {
private static ApplicationContext context;
public static <T> T getSingleBeanOfType(Class<T> beanClass) {
return context.getBeansOfType(beanClass).values().iterator().next();
}
@Override
public void setApplicationContext(ApplicationContext context) throws BeansException {
UtilsForSpring.context = context;
}
}
config.xml 文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<context:component-scan base-package="com.myproject.vaadinapp"/>
<context:annotation-config/>
<context:property-placeholder location="classpath:/hibernate.properties"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<mvc:annotation-driven/>
<task:annotation-driven/>
<bean id="clearReservedPstnBbk" class="com.myproject.vaadinapp.MainUI"></bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.SingleConnectionDataSource">
<property name="driverClassName" value="${db.driverClassName}"></property>
<property name="url" value="${db.url}"></property>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
<property name="suppressClose" value="true"/>
</bean>
<bean id="hibernateCfgProperties"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="properties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.use_sql_comments">true</prop>
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
<prop key="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>
<prop key="hibernate.c3p0.testConnectionOnCheckout">true</prop>
<prop key="hibernate.c3p0.timeout">1800</prop>
<prop key="hibernate.c3p0.maxIdleTimeExcessConnections">20</prop>
<prop key="hibernate.c3p0.validate">false</prop>
<prop key="hibernate.c3p0.idle_test_period">30</prop>
<prop key="hibernate.c3p0.automaticTestTable">conTestTable</prop>
</props>
</property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties" ref="hibernateCfgProperties"/>
<property name="packagesToScan" value="com.myproject.vaadinapp.model"/>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</beans>
这里有错误：
]] Root cause of ServletException.
com.vaadin.server.ServiceException: java.lang.NullPointerException
at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1474)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1434)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.websocket.tyrus.TyrusServletFilter.doFilter(TyrusServletFilter.java:205)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
Caused By: java.lang.NullPointerException
at net.egemsoft.ahenk.utils.UtilsForSpring.getSingleBeanOfType(UtilsForSpring.java:17)
at net.egemsoft.ahenk.utils.DBDefaultValues.addDefaultCompany(DBDefaultValues.java:34)
at net.egemsoft.ahenk.utils.DBDefaultValues.initialize(DBDefaultValues.java:25)
at net.egemsoft.ahenk.MainUI.init(MainUI.java:83)
at com.vaadin.ui.UI.doInit(UI.java:698)
at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:214)
at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:844)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:346)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.websocket.tyrus.TyrusServletFilter.doFilter(TyrusServletFilter.java:205)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3436)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3402)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2285)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2201)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1572)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
>
很可能，您的 DBDefaultValues bean 是在 UtilsForSpring 之前构建的。你需要强制执行此操作。
更改您的 config.xml 以便 spring 将首先构建您的实用程序 bean。像这样：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
<bean class="path.to.UtilsForSpring" />
<context:component-scan base-package="com.myproject.vaadinapp"/>
您可以像以前一样继续使用注释。
如果上述方法有效，那么您可以继续在 addDefaultCompany 方法上使用 @DependsOn 批注，并从 config.xml.
中删除新添加的 bean 定义@DependsOn(value = "utilsForSpring")
private static void addDefaultCompany() {
ICompanyService companyService =
UtilsForSpring.getSingleBeanOfType(ICompanyService.class); //line:34
if (companyService.getCompanies().size() == 0) {
Company company = new Company();
company.setCompanyName("MyComapny");
companyService.save(company);
}
}
我解决了问题！原因是我习惯了一个 Vaadin 附加组件。我尝试了所有版本的附加组件，但它无法与 weblogic server 12.1.3 一起正常工作
<dependency>
<groupId>org.vaadin.addon</groupId>
<artifactId>jfreechartwrapper</artifactId>
<version>3.0.0</version>
</dependency>