项目环境：spring+hibernate+struts_jdk8+tomcat9
问题引入：
我在看别人代码时，其项目中使用了一个spring.jar，在启动时报错信息提示：ComponentScanBeanDefinitionParser are only available on JDK 1.5 and higher。
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [beans.xml]; nested exception is java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:420)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:124)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:92)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:422)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4682)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5150)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:713)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1729)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:457)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:406)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at java.security.AccessController.doPrivileged(Native Method)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Context namespace element 'component-scan' and its parser class [org.springframework.context.annotation.ComponentScanBeanDefinitionParser] are only available on JDK 1.5 and higher
at org.springframework.context.config.ContextNamespaceHandler$1.parse(ContextNamespaceHandler.java:65)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:69)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1297)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1287)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
... 60 more
08-Jun-2021 09:28:30.974 淇℃伅 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
于是查找了很多博客，说是spring的低版本jar包不支持jdk1.8,只支持jdk1.6和jdk1.7。org.springframework.context.annotation.AnnotationConfigBeanDefinitionParser自动检测，jdk版本检测的时候需要jre1.5以上版本，但是JdkVersion只检查到了1.7，而在jre1.8 时不匹配任何jdk。
解决方案：
（1）重新建立一个包，名字为：org.springframework.core
（2）在这个包下新建JdkVersion.java类，其内容如下：
/*
* Copyright 2002-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.core;
/**
* Internal helper class used to find the Java/JDK version
* that Spring is operating on, to allow for automatically
* adapting to the present platform's capabilities.
*
* <p>Note that Spring requires JVM 1.4 or higher, as of Spring 2.5.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rick Evans
*/
public abstract class JdkVersion {
/**
* Constant identifying the 1.3.x JVM (JDK 1.3).
*/
public static final int JAVA_13 = 0;
/**
* Constant identifying the 1.4.x JVM (J2SE 1.4).
*/
public static final int JAVA_14 = 1;
/**
* Constant identifying the 1.5 JVM (Java 5).
*/
public static final int JAVA_15 = 2;
/**
* Constant identifying the 1.6 JVM (Java 6).
*/
public static final int JAVA_16 = 3;
/**
* Constant identifying the 1.7 JVM (Java 7).
*/
public static final int JAVA_17 = 4;
public static final int JAVA_18 = 4;
private static final String javaVersion;
private static final int majorJavaVersion;
static {
javaVersion = System.getProperty("java.version");
// version String should look like "1.4.2_10"
if(javaVersion.indexOf("1.8.") != -1){
majorJavaVersion = JAVA_18;
}else if (javaVersion.indexOf("1.7.") != -1) {
majorJavaVersion = JAVA_17;
}
else if (javaVersion.indexOf("1.6.") != -1) {
majorJavaVersion = JAVA_16;
}
else if (javaVersion.indexOf("1.5.") != -1) {
majorJavaVersion = JAVA_15;
}
else {
// else leave 1.4 as default (it's either 1.4 or unknown)
majorJavaVersion = JAVA_14;
}
}
/**
* Return the full Java version string, as returned by
* <code>System.getProperty("java.version")</code>.
* @return the full Java version string
* @see System#getProperty(String)
*/
public static String getJavaVersion() {
return javaVersion;
}
/**
* Get the major version code. This means we can do things like
* <code>if (getMajorJavaVersion() < JAVA_14)</code>.
* @return a code comparable to the JAVA_XX codes in this class
* @see #JAVA_13
* @see #JAVA_14
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static int getMajorJavaVersion() {
return majorJavaVersion;
}
/**
* Convenience method to determine if the current JVM is at least Java 1.4.
* @return <code>true</code> if the current JVM is at least Java 1.4
* @see #getMajorJavaVersion()
* @see #JAVA_14
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static boolean isAtLeastJava14() {
return true;
}
/**
* Convenience method to determine if the current JVM is at least
* Java 1.5 (Java 5).
* @return <code>true</code> if the current JVM is at least Java 1.5
* @see #getMajorJavaVersion()
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static boolean isAtLeastJava15() {
return getMajorJavaVersion() >= JAVA_15;
}
/**
* Convenience method to determine if the current JVM is at least
* Java 1.6 (Java 6).
* @return <code>true</code> if the current JVM is at least Java 1.6
* @see #getMajorJavaVersion()
* @see #JAVA_16
* @see #JAVA_17
*/
public static boolean isAtLeastJava16() {
return getMajorJavaVersion() >= JAVA_16;
}
}