Freemaker的java.beans.IntrospectionException: type mismatch between read and write methods

引言：freemaker在特定的spring以及jdk下的问题解决路径。

环境描述

spring 3.1.1, jdk1.8u80, freemake 2.3.19

错误信息描述：

严重: Exception sending context initialized event to listener instance of class org.jeecgframework.web.system.listener.OnlineListener

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘freemarker’ defined in file [D:\OpenSource\jeewx\jeewx\target\classes\spring-mvc-cgform.xml]: Initialization of bean failed; nested exception is org.springframework.beans.FatalBeanException: Failed to obtain BeanInfo for class [freemarker.template.Configuration]; nested exception is java.beans.IntrospectionException: type mismatch between read and write methods

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)

at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385)

at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284)

at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)

at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)

at org.apache.catalina.startup.Embedded.start(Embedded.java:825)

at org.codehaus.mojo.tomcat.AbstractRunMojo.startContainer(AbstractRunMojo.java:558)

at org.codehaus.mojo.tomcat.AbstractRunMojo.execute(AbstractRunMojo.java:255)

at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)

at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)

at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)

at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)

at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)

at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)

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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)

at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

Caused by: org.springframework.beans.FatalBeanException: Failed to obtain BeanInfo for class [freemarker.template.Configuration]; nested exception is java.beans.IntrospectionException: type mismatch between read and write methods

at org.springframework.beans.CachedIntrospectionResults.(CachedIntrospectionResults.java:262)

at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:149)

at org.springframework.beans.BeanWrapperImpl.getCachedIntrospectionResults(BeanWrapperImpl.java:324)

at org.springframework.beans.BeanWrapperImpl.getPropertyDescriptors(BeanWrapperImpl.java:331)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.filterPropertyDescriptorsForDependencyCheck(AbstractAutowireCapableBeanFactory.java:1242)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1101)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)

… 42 more

Caused by: java.beans.IntrospectionException: type mismatch between read and write methods

at java.beans.PropertyDescriptor.findPropertyType(PropertyDescriptor.java:661)

at java.beans.PropertyDescriptor.setReadMethod(PropertyDescriptor.java:257)

at org.springframework.beans.ExtendedBeanInfo.addOrUpdatePropertyDescriptor(ExtendedBeanInfo.java:282)

at org.springframework.beans.ExtendedBeanInfo.addOrUpdatePropertyDescriptor(ExtendedBeanInfo.java:180)

at org.springframework.beans.ExtendedBeanInfo.(ExtendedBeanInfo.java:100)

at org.springframework.beans.CachedIntrospectionResults.(CachedIntrospectionResults.java:224)

… 48 more

错误的核心关键词是java.beans.IntrospectionException: type mismatch between read and write method。

直观来分析就是javaBean中的方法调用问题，之前的版本和运行都是正确的，所以锁定jdk或者spring版本的问题。

解决方法

经过一番的查找和验证，解决的思路有以下两个：

• downgrade至JDK 1.7

• 升级至spring 4.1.2+

参考资料

• https://stackoverflow.com/questions/27825563/freemarker-issues-with-java-8

• https://jira.spring.io/browse/SPR-12448