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该问题已被官方收录

redis默认只允许本地访问，要使redis可以远程访问可以修改redis.co

0

1

redis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

不能将redis连接放回池内，放回连接池的对象是无效的对象。查看redis服务端的连接数详细信息如下，前9个连接，idle＝453，空闲了453秒了，依然没有释放，而连接池设置的是空闲60秒就会被释放，明显发生异常了

该问题已被官方收录

tocamt启动出错

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

memcached配置问题

0

1

memcache

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
      xmlns:context="http://www.springframework.org/schema/context"
      xmlns:tx="http://www.springframework.org/schema/tx" xmlns:task="http://www.springframework.org/schema/task"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xsi:schemaLocation="
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
     http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd
      http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd ">
   <!-- properties config   -->
   <bean class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
       <property name="order" value="1"/>
       <property name="ignoreUnresolvablePlaceholders" value="true"/>
       <property name="locations">
           <list>
               <value>classpath:memcached.properties</value>
           </list>
       </property>
   </bean>
   <!--Memcached配置-->
   <!--
      枚举类型要想注入到类中，一定要先使用org.springframework.beans.factory.config.FieldRetrievingFactoryBean类将枚举类型进行转换
      将DefaultHashAlgorithm.KETAMA_HASH转换为KETAMA_HASH这个bean，
      然后在要注入的bean中使用<property name="hashAlg" ref="KETAMA_HASH" />引用即可。-->
<bean id="memCachedPool" class="com.danga.MemCached.SockIOPool"  factory-method="getInstance" init-method="initialize" destroy-method="shutDown">
   <constructor-arg>
       <value>memCachedPool</value>
   </constructor-arg>
   <property name="servers">
   <!-- ${memcached.server} -->
   <list>
       <value>${memcached.server}:${memcached.port1}</value>
   </list>
</property>
   <property name="initConn">
       <value>${memcached.initConn}</value>
   </property>
   <property name="minConn">
       <value>${memcached.minConn}</value>
   </property>
   <property name="maxConn">
       <value>${memcached.maxConn}</value>
   </property>
   <property name="maintSleep">
       <value>${memcached.mainSleep}</value>
   </property>
   <property name="nagle">
       <value>${memcached.nagle}</value>
   </property>
   <property name="socketTO">
       <value>${memcached.socketTO}</value>
   </property>
</bean>
   <bean id="memCachedClient" >
   <constructor-arg>
       <value>memCachedPool</value>
   </constructor-arg>
</bean>
</beans>

该问题已被官方收录

memcache有三种客户端，在实际应用中如何取舍？

2

1

memcache

class="cursor-pointer"> 详细描述

该问题已被官方收录

通配符的匹配很全面, 但无法找到元素

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

17:21:22,400 ERROR main context.ContextLoader:331 - Context initialization failed
org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 14 in XML document from URL [file:/F:/workspace/spring/target/classes/applicationContext.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 14; columnNumber: 54; cvc-complex-type.2.4.c: 通配符的匹配很全面, 但无法找到元素 'context:component-scan' 的声明。
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:399)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
	at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
	at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
	at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
	at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
	at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:452)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
	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:133)
	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:108)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
	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:483)
	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)

该问题已被官方收录

无法从本地连接服务器的memcached

0

1

memcache

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

 <!-- Memcached配置 -->
    <!-- p:connectionPoolSize="${memcached.connectionPoolSize}"   p:failureMode="${memcached.failureMode}" -->
    <bean   id="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
        <constructor-arg>
            <list>
                <bean class="java.net.InetSocketAddress">
                    <constructor-arg>
                        <value>${memcached.server1.host}</value>
                    </constructor-arg>
                    <constructor-arg>
                        <value>${memcached.server1.port}</value>
                    </constructor-arg>
                </bean>
            </list>
        </constructor-arg>
        <constructor-arg>
            <list>
                <value>${memcached.server1.weight}</value>
            </list>
        </constructor-arg>

        <!-- (1) 协议工厂 net.rubyeye.xmemcached.command.BinaryCommandFactory(二进制)
                     (2) 协议工厂 net.rubyeye.xmemcached.command.TextCommandFactory(文本)
                     (3) 协议工厂 net.rubyeye.xmemcached.command.KestrelCommandFactory(可靠获取) -->
        <property name="commandFactory" >
            <bean class="net.rubyeye.xmemcached.command.TextCommandFactory" />
        </property>

        <!-- (1) net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator 分布策略，一致性哈希（用于增加主机时降低未命中率问题的解决）
			 (2) ArrayMemcachedSessionLocator(默认) ,默认分布的策略是按照key的哈希值模以连接数得到的余数，对应的连接就是将要存储的节点  -->
        <property name="sessionLocator" >
            <bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator" />
        </property>

        <!--序列化转换器-->
        <property name="transcoder" >
            <bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
        </property>

        <property name="connectionPoolSize" value="${memcached.connectionPoolSize}" />
        <property name="failureMode" value="${memcached.failureMode}" />
    </bean>

该问题已被官方收录

配置xmemcache出错

0

1

memcache

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userControllerLogin': Failed to introspect bean class [com.ptteng.controller.UserControllerLogin] for lookup method metadata: could not find class that it depends on; nested exception is java.lang.NoClassDefFoundError: net/rubyeye/xmemcached/MemcachedClient

该问题已被官方收录

redis缓存对象时，对象已经序列化之后，还是报错

0

1

redis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

实体类：
public class People implements Serializable {}
配置文件：
<!--扫描redis配置文件-->
    <context:property-placeholder ignore-unresolvable="true" location="classpath:redis.properties"/>
    <!--设置连接池-->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}"/>
        <property name="maxTotal" value="${redis.maxTotal}"/>
        <property name="maxWaitMillis" value="${redis.maxWaitMillis}"/>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"/>
        <property name="testOnReturn" value="${redis.testOnReturn}"/>
    </bean>
    <!--设置链接属性-->
    <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
          p:hostName="${redis.host}"
          p:port="${redis.port}"
          p:pool-config-ref="poolConfig"
          p:timeout="100000"/>
    <!-- Jedis模板配置  -->
    <bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
    </bean>

该问题已被官方收录

做Redis缓存配置时，Spring找不到Redis的连接配置

2

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

26-Nov-2018 08:51:25.731 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log No Spring WebApplicationInitializer types detected on classpath
26-Nov-2018 08:51:25.818 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Initializing Spring root WebApplicationContext
26-Nov-2018 08:51:28.723 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]
 org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'poolConfig' defined in class path resource [spring-redis.xml]: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"
	at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:211)
	at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:222)
	at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:86)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:162)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4792)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)
	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:483)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
	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:483)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)
	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:483)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399)
	at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:828)
	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:483)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
	at sun.rmi.transport.Transport$1.run(Transport.java:178)
	at sun.rmi.transport.Transport$1.run(Transport.java:175)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:174)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174)
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
	at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer$PlaceholderResolvingStringValueResolver.resolveStringValue(PropertyPlaceholderConfigurer.java:258)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveStringValue(BeanDefinitionVisitor.java:282)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveValue(BeanDefinitionVisitor.java:204)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitPropertyValues(BeanDefinitionVisitor.java:141)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitBeanDefinition(BeanDefinitionVisitor.java:82)
	at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:208)
	... 52 more

26-Nov-2018 08:51:28.728 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext

<?xml version="1.0" encoding="UTF-8"?>
<beans    xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:p="http://www.springframework.org/schema/p"
          xmlns:tx="http://www.springframework.org/schema/tx"
          xmlns:context="http://www.springframework.org/schema/context"
          xsi:schemaLocation="
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="jnshu"/>
    <context:property-placeholder location="classpath:redis.properties" ignore-unresolvable="true"/>
    <!--设置数据池-->
    <bean id="poolConfig"  class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}"></property>
        <property name="minIdle" value="${redis.minIdle}"></property>
        <property name="maxTotal" value="${redis.maxTotal}"></property>
        <property name="maxWaitMillis" value="${redis.maxWaitMillis}"></property>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"></property>
    </bean>
    <!--链接redis-->
    <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.host}"></property>
        <property name="port" value="${redis.port}"></property>
        <!--<property name="password" value="${redis.password}"></property>-->
        <property name="poolConfig" ref="poolConfig"></property>
    </bean>

    <!-- redis 序列化策略 ，手动指定 key 采用String序列化策略 -->
    <bean id="stringSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer"/>

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="keySerializer" ref="stringSerializer"/>
        <!-- 开启事务，可以通过transcational注解控制 -->
        <property name="enableTransactionSupport" value="true"/>
    </bean>
        <!--<property name="hashValueSerializer">
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />
        </property>-->
    <!--</bean>-->

</beans>

该问题已被官方收录

使用了memcached之后用Jmeter压测性能提升不大

2

1

压测

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

    public List<Student> list(){
//        List<Student> studentlist;
//        if ((studentlist=cacheManager.get("studentlist"))!=null)
//        return studentlist;
//        else {
//            studentlist = studentMapper.list();
//            cacheManager.add("studentlist",studentlist);
//            return studentlist;
//        }
        return studentMapper.list();
    }

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