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Posted on Edited on Symbols count in article: 3.5k Reading time ≈ 3 mins.

报错如下：

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27-Feb-2017 12:53:31.268 严重 [RMI TCP Connection(13)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp
 Java.lang.IllegalArgumentException: addChild:  Child name '/hisen' is not unique
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.Java:738)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.Java:728)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.Java:734)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.Java:1702)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:43)
	at Java.lang.reflect.Method.invoke(Method.Java:606)
	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:482)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.Java:431)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:43)
	at Java.lang.reflect.Method.invoke(Method.Java:606)
	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:1487)
	at Javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.Java:97)
	at Javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.Java:1328)
	at Javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.Java:1420)
	at Javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.Java:848)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:43)
	at Java.lang.reflect.Method.invoke(Method.Java:606)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.Java:322)
	at sun.rmi.transport.Transport$1.run(Transport.Java:177)
	at sun.rmi.transport.Transport$1.run(Transport.Java:174)
	at Java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.Java:173)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.Java:556)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.Java:811)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.Java:670)
	at Java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.Java:1145)
	at Java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.Java:615)
	at Java.lang.Thread.run(Thread.Java:744)

重要的是：

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org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp
 Java.lang.IllegalArgumentException: addChild:  Child name '/hisen' is not unique

IDEA解决办法

Project Structure -> Artifacts

查看里面是否有配置相同的Artifacts

删除即可

Posted on Edited on In Symbols count in article: 2.2k Reading time ≈ 2 mins.

可以使用ps命令。
它能显示当前运行中进程的相关信息，包括进程的PID。

Linux和UNIX都支持ps命令，显示所有运行中进程的相关信息。

ps命令能提供一份当前进程的快照。如果想状态可以自动刷新，可以使用top命令。

ps命令

输入下面的ps命令，显示所有运行中的进程：

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ps aux | less

这个命令按 q 退出
后面加了“| less”就会分页显示，如果去掉会一次性显示出所有结果

输出：

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Posted on Edited on In Symbols count in article: 4.8k Reading time ≈ 4 mins.

目前的形式来说Java后台市场还是挺大，虽然也有很多python和php的系统。

要想从事企业级的项目开发，你必须掌握如下要点：

  1. 掌握项目开发的基本步骤
  2. 具备极强的面向对象的分析与设计技巧
  3. 掌握用例驱动、以架构为核心的主流开发方法

没有人愿意自己一辈子就满足于掌握了一些代码实现的技巧，

别人告诉你要实现什么，你就用代码堆砌来实现别人的要求！

你必须学会从整个项目的角度去思考！

你必须学会假如你是项目经理，你该如何思考！

你必须学会假如你是架构师，你该如何思考！

你必须掌握针对某个特定问题领域的分析方法！

关于基础知识：

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Posted on Edited on In Symbols count in article: 1.7k Reading time ≈ 2 mins.

一、安装

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sudo apt-get install zookeeper

默认信息

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#安装路径
/usr/share/zookeeper
#配置文件
/etc/zookeeper/conf/zoo.cfg

二、启动服务端

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Posted on Edited on Symbols count in article: 1.7k Reading time ≈ 2 mins.

出现的问题：

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[platform] ERROR 2017-02-22 17:46:05,756 [RMI TCP Connection(4)-127.0.0.1] org.springframework.web.context.ContextLoader.() | Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pmTranLimitLiteServiceImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.msds.zkutil.ZkLockFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@Javax.annotation.Resource(mappedName=, shareable=true, description=, name=, type=class Java.lang.Object, authenticationType=CONTAINER, lookup=)}
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.Java:306) ~[spring-context-3.2.4.RELEASE.jar:3.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.Java:1116) ~[spring-beans-3.2.4.RELEASE.jar:3.2.4.RELEASE]

最重要的是这句

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org.springframework.beans.factory.BeanCreationException:
Error creating bean with name'pmTranLimitLiteServiceImpl'

出现的原因：
缺少相关的jar包或者依赖

建议不要自己配置idea的module和artificts

直接在pom.xml文件添加

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<artifactId>hisen-project</artifactId><!--加在这句话后面-->
  <packaging>war</packaging><!--加上这句话就会自动给你打war包-->

其他原因

开始不知道什么问题，后来搜索这个服务。

发现这跟dubbo有关，于是百度搜索进了官网

没想到常见问题里面就有说这个事情

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13. 出现org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxxService': Initialization of bean failed; nested exception is Java.lang.IllegalArgumentException: Method must not be null怎么办？

通常是classpath下存在spring多个版本的jar包，排除掉不需要的spring包即可。

更多dubbo问题：点击查看

Posted on Edited on In Symbols count in article: 136 Reading time ≈ 1 mins.

Java.Lang.OutOfMemoryError: PermGen Space

Tomcat只分配了非常小的PermGen内存，这里重新设置一下

直接在配置tomcat的时候,在VM options填入:

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-XX:PermSize=97m -XX:MaxPermSize=256m

Posted on Edited on In Symbols count in article: 534 Reading time ≈ 1 mins.

windows系统

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cd %userprofile%\.m2\repository
for /r %i in (*.lastUpdated) do del %i

或者新建一个bat文件，批处理。就不用每次都在cmd敲命令了

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@echo off
echo 确认删除maven仓库下*.lastUpdated文件？
pause
::create by hisenyuan(hisenyuan@gmail.com)

::这里写你的仓库路径
set REPOSITORY_PATH=C:\hisenwork\soft\maven
echo 正在搜索...
for /f "delims=" %%i in ('dir /b /s "%REPOSITORY_PATH%\*lastUpdated*"') do (
    del /s /q %%i
)
echo 完毕
pause

linux系统

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find /app/maven/localRepository -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;

Posted on Edited on In Symbols count in article: 7.9k Reading time ≈ 7 mins.

这几天折腾ubuntu然后安装了下mongodb

通过Oracle VM VirtualBox端口转发，连接了虚拟机的MongoDB

1.用idea创建一个maven项目

2.在pom.xml中添加mongodb Java驱动

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<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.2.2</version>
</dependency>

3.参考官方：MongoDB Driver Quick Tour

本用例github地址：mongodbTest

贴下代码：

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