Vaadin应用在部署时抛出异常。

我仍在努力让Vaadin应用程序在Tomcat上运行。

在解决了一个描述在Vaadin应用程序部署到Tomcat无法启动的问题后，

我遇到了另一个与我的代码无关的异常。

我在代码中没有定义任何数据源。我通过REST API调用获取所有数据。然而，Tomcat不会运行我的war文件，catalina.out文件中会出现以下异常：

java.lang.IllegalStateException: Error starting child

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:686)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)

at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1023)

at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1910)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)

at java.util.concurrent.FutureTask.run(FutureTask.java:264)

at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)

at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123)

at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:824)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)

at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)

at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)

at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)

at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:898)

at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)

at java.util.concurrent.FutureTask.run(FutureTask.java:264)

at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)

at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:871)

at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardService.startInternal(StandardService.java:428)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:917)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.startup.Catalina.start(Catalina.java:772)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/encyclopediaView]]

at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)

... 35 more

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)

at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731)

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)

at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)

at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:175)

at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:155)

at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:97)

at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:174)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4929)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

... 36 more

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)

... 58 more

Caused by: org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class

at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:182)

at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:123)

at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:48)

at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Tomcat.dataSource(DataSourceConfiguration.java:64)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)

... 59 more

由于没有提及到我的任何类，我甚至不知道在哪里寻找问题。

当我将该应用程序作为IDE中的JAR文件运行时，我没有遇到这个问题，一切都正常工作。我甚至将MySQL JDBC驱动程序添加到Tomcat的/lib目录中，但没有改变任何事情。

有人可以告诉我还可以做什么来使它在Tomcat上工作吗？