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Spring Boot如何控制Tomcat缓存?

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我将带有JSP的5年前的Spring MVC应用程序移植到Spring Boot . 因此,根据样品http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-jsp-limitations我正在使用"war"包装 .

嵌入式tomcat启动 . 但是,日志中充满了缓存警告,如下例所示

2016-08-25 14:59:01.442  INFO 28884 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2016-08-25 14:59:01.456  INFO 28884 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2016-08-25 14:59:01.458  INFO 28884 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.4
2016-08-25 14:59:01.531  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/displaytag-1.2.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:01.531  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/decrex-maven-0.1.10-SNAPSHOT.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:01.531  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/spring-boot-actuator-1.4.0.RELEASE.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:01.531  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/validation-api-1.1.0.Final.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:01.532  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/lucene-backward-codecs-5.3.1.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:01.532  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/lucene-queries-5.3.1.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
.....
2016-08-25 14:59:05.121  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/lib/jstl-1.2.jar] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:05.139  WARN 28884 --- [ost-startStop-1] org.apache.catalina.webresources.Cache   : Unable to add the resource at [/WEB-INF/classes/commons-logging.properties] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
2016-08-25 14:59:05.139  INFO 28884 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2016-08-25 14:59:05.139  INFO 28884 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 7117 ms
.....
2016-08-25 15:02:03.960  INFO 28884 --- [ndardContext[]]] org.apache.catalina.webresources.Cache   : The background cache eviction process was unable to free [10] percent of the cache for Context [] - consider increasing the maximum size of the cache. After eviction approximately [9,251] KB of data remained in the cache.

我没有在Spring Boot中找到控制它的方法 . 请, advise!!!


我在下面尝试了安迪威尔金森的建议 . 也尝试在 EmbeddedServletContainerCustomizer 中使用它

@Component
public class ServletContainerCustomizer implements EmbeddedServletContainerCustomizer {

    private static final Log log = LogFactory.getLog(ServletContainerCustomizer.class);

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        if (TomcatEmbeddedServletContainerFactory.class.isAssignableFrom(container.getClass())) {

            int cacheSize = 256 * 1024;
            log.info("Customizing tomcat factory. New cache size (KB) is " + cacheSize);

            TomcatEmbeddedServletContainerFactory tomcatFactory = (TomcatEmbeddedServletContainerFactory) container;
            tomcatFactory.addContextCustomizers((context) -> {
                StandardRoot standardRoot = new StandardRoot(context);
                standardRoot.setCacheMaxSize(cacheSize);
            });

        }
    }

}

有关更改缓存大小的消息在日志中,但警告上的 code above has no influence

3 回答

  • 1

    我一直有同样的问题,但安迪威尔金森的暗示让我走上正轨 . 对我有用的是将缓存设置为Andy所做的,但随后也在上下文中明确设置了资源 .

    @Bean
    public EmbeddedServletContainerFactory servletContainer() {
        TomcatEmbeddedServletContainerFactory tomcatFactory = new TomcatEmbeddedServletContainerFactory() {
            @Override
            protected void postProcessContext(Context context) {
                final int cacheSize = 40 * 1024;
                StandardRoot standardRoot = new StandardRoot(context);
                standardRoot.setCacheMaxSize(cacheSize);
                context.setResources(standardRoot); // This is what made it work in my case.
    
                logger.info(String.format("New cache size (KB): %d", context.getResources().getCacheMaxSize()));
            }
        };
        return tomcatFactory;
    }
    

    希望这可以帮助!

  • 3

    您可以使用上下文自定义程序配置缓存大小,以使用自定义的 StandardRoot 配置上下文:

    Java 7:

    @Bean
    public TomcatEmbeddedServletContainerFactory tomcatFactory() {
        TomcatEmbeddedServletContainerFactory tomcatFactory = new TomcatEmbeddedServletContainerFactory();
        tomcatFactory.addContextCustomizers(new TomcatContextCustomizer() {
    
            @Override
            public void customize(Context context) {
                StandardRoot standardRoot = new StandardRoot(context);
                standardRoot.setCacheMaxSize(40 * 1024);
            }
    
        });
        return tomcatFactory;
    }
    

    Java 8:

    @Bean
    public TomcatEmbeddedServletContainerFactory tomcatFactory() {
        TomcatEmbeddedServletContainerFactory tomcatFactory = new TomcatEmbeddedServletContainerFactory();
        tomcatFactory.addContextCustomizers((context) -> {
            StandardRoot standardRoot = new StandardRoot(context);
            standardRoot.setCacheMaxSize(40 * 1024);
        });
        return tomcatFactory;
    }
    
  • 10

    参考答案here,我创建了src / main / webapp / META-INF / context.xml并添加了以下内容 .

    <?xml version="1.0" encoding="UTF-8"?>
    <Context>
      <Resources cachingAllowed="true" cacheMaxSize="204800" />
    </Context>
    

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