我必须使用JDK 1.6，SpringBoot来实现CRUD。
我决定分两步解决此问题：
JDK 1.8）写CRUD JDK 1.6重新配置SpringBoot 我使用H2编写了简单的CRUD。它在JDK 1.8中工作正常。我使用Tomcat 9作为servlet容器。
当我开始为JDK 1.6重新配置项目时出现了问题。
我使用了this条文章。更改仅影响SpringBootApplication类和pom.xml，以及它们现在的外观：
SpringBootApplication.java：
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import my.package.controllers.NotificationController;
import my.package.repositories.NotificationRepository;
import my.package.services.NotificationService;
@SpringBootApplication
public class NotificationServiceApplication extends SpringBootServletInitializer {
// As I understand - I have to manually put classes to ApplicationContext
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
application.sources(
NotificationServiceApplication.class
, NotificationService.class
, NotificationRepository.class
, NotificationController.class
);
return application;
}
}
pom.xml：（我从应用程序中排除了嵌入式tomcat，并将其部署到tomcat 7，因为它支持JDK 1.6。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>my.package</groupId>
<artifactId>notificationservice</artifactId>
<version>1.0.1</version>
<packaging>war</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
<relativePath/>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<groupId>javax.transaction</groupId>
<artifactId>javax.transaction-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.191</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.16</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<defaultGoal>install</defaultGoal>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
但是，无论将war部署到tomcat 7时，都会出现此错误：
2018-08-23 18:44:22.066 WARN 8128 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [my.package.NotificationServiceApplication]; nested exception is java.lang.UnsupportedClassVersionError: org/apache/tomcat/jdbc/pool/DataSource : Unsupported major.minor version 51.0
2018-08-23 18:44:22.069 ERROR 8128 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@49f4bcf7: startup date [Thu Aug 23 18:44:21 MSK 2018]; root of context hierarchy
at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:404) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:954) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:961) [spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1033) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:555) [spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at my.package.NotificationServiceApplication.main(NotificationServiceApplication.java:26) [classes/:na]
2018-08-23 18:44:22.076 ERROR 8128 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [my.package.NotificationServiceApplication]; nested exception is java.lang.UnsupportedClassVersionError: org/apache/tomcat/jdbc/pool/DataSource : Unsupported major.minor version 51.0
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:541) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:475) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:184) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:324) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:246) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:270) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at my.package.NotificationServiceApplication.main(NotificationServiceApplication.java:26) [classes/:na]
Caused by: java.lang.UnsupportedClassVersionError: org/apache/tomcat/jdbc/pool/DataSource : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.6.0_45]
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) ~[na:1.6.0_45]
at java.lang.ClassLoader.defineClass(ClassLoader.java:615) ~[na:1.6.0_45]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) ~[na:1.6.0_45]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) ~[na:1.6.0_45]
at java.net.URLClassLoader.access$000(URLClassLoader.java:58) ~[na:1.6.0_45]
at java.net.URLClassLoader$1.run(URLClassLoader.java:197) ~[na:1.6.0_45]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.6.0_45]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190) ~[na:1.6.0_45]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[na:1.6.0_45]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) ~[na:1.6.0_45]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[na:1.6.0_45]
at org.springframework.util.ClassUtils.forName(ClassUtils.java:250) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder.findType(DataSourceBuilder.java:123) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$PooledDataSourceAvailableCondition.getDataSourceClassLoader(DataSourceAutoConfiguration.java:178) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$PooledDataSourceAvailableCondition.getMatchOutcome(DataSourceAutoConfiguration.java:162) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AbstractNestedCondition$MemberOutcomes.getConditionOutcome(AbstractNestedCondition.java:194) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AbstractNestedCondition$MemberOutcomes.<init>(AbstractNestedCondition.java:187) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AbstractNestedCondition$MemberConditions.getMatchOutcomes(AbstractNestedCondition.java:165) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AbstractNestedCondition$MemberMatchOutcomes.<init>(AbstractNestedCondition.java:80) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AbstractNestedCondition.getMatchOutcome(AbstractNestedCondition.java:64) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.AnyNestedCondition.getMatchOutcome(AnyNestedCondition.java:47) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47) ~[spring-boot-autoconfigure-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:102) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:202) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processMemberClasses(ConfigurationClassParser.java:329) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:247) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:230) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:532) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
... 15 common frames omitted
Process finished with exit code 1