SpringMVC Integration mit FreeMarker

Question

Ich arbeite über Online-Beispiele, um SpringMVC mit FreeMarker zu lernen. Ich bin mit diesem Fehler konfrontiert worden, aber ich kann nicht herausfinden, was mit meiner Methode getFreemarkerConfig() falsch ist und den ganzen Tag habe ich versucht, es zu beheben, bu erfolglos nichts getan.

@EnableWebMvc 
@Configuration 
@ComponentScan(basePackages = "com.capfer") 
public class Webconfig extends WebMvcConfigurerAdapter { 

    @Bean 
    public ViewResolver getViewResolver() { 
     FreeMarkerViewResolver frViewResolver = new FreeMarkerViewResolver(); 
     frViewResolver.setCache(false); 
     // frViewResolver.setPrefix(""); 
     frViewResolver.setSuffix(".ftl"); 

     return frViewResolver; 
    } 

    @Bean 
    public FreeMarkerConfigurer getFreemarkerConfig() throws IOException, TemplateException { 
     FreeMarkerConfigurationFactory factory = new FreeMarkerConfigurationFactory(); 
     factory.setTemplateLoaderPath("/WEB-INF/pages/"); 
     factory.setDefaultEncoding("UTF-8"); 
     FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer(); 
     freeMarkerConfigurer.setConfiguration(factory.createConfiguration()); 
     return freeMarkerConfigurer; 
    } 
} 


SEVERE: Context initialization failed 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getFreemarkerConfig' defined in com.capfer.configuration.Webconfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer]: Factory method 'getFreemarkerConfig' threw exception; nested exception is java.lang.NoSuchMethodError: freemarker.template.Configuration.<init>(Lfreemarker/template/Version;)V 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) 
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443) 
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325) 
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) 
    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:208) 
    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:862) 
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286) 
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:197) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    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.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer]: Factory method 'getFreemarkerConfig' threw exception; nested exception is java.lang.NoSuchMethodError: freemarker.template.Configuration.<init>(Lfreemarker/template/Version;)V 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) 
    ... 45 more 

Answer 1

Der Wurzel Fehler ist dies: "java.lang.NoSuchMethodError: freemarker.template.Configuration (Lfreemarker/template/Version;) V.". Das bedeutet, dass Sie eine alte FreeMarker-Abhängigkeit haben, wo es noch keinen Configuration(Version)-Konstruktor gab. Stellen Sie daher sicher, dass Sie die neueste Version von FreeMarker verwenden (2.3.26-incubating ist die neueste stabile Version zum Zeitpunkt der Erstellung). (Wenn die alte Version eine transitive Abhängigkeit ist, müssen Sie sie ausschließen, damit sie später nicht mehr gewinnt, wenn sich das Abhängigkeitsdiagramm ändert.)