springMVC整合xxl-job踩过的各种坑

前言：

到公司后使用的一直是springboot，突然接到一个任务，将老项目springMvc的定时任务改成使用xxl-job的，修改过程中踩了不少坑，特在此留贴记录：
配置过程参考文章
https://blog.csdn.net/weixin_39433171/article/details/80929270

1.拒接连接

解决过程：查询本地端口情况（cmd:netstat -ano）,发现9998端口并没有被监听，故推测，配置文件未生效，导致执行器端口没有启用，然后检测springMvc的扫描配置，发现未扫描配置文件。添加扫描后，此bug解决。

2.jar包不完整

添加后，发现项目无法正常启动，启动过程中报错：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxlJobExecutor' defined in file [E:\workspace-idea\education\target\RemoteEducation-0.0.1-SNAPSHOT\WEB-INF\classes\config\spring-xxl-job.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/eclipse/jetty/util/thread/ThreadPool
	...
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jetty/util/thread/ThreadPool
	at com.xxl.job.core.rpc.netcom.jetty.server.JettyServer.start(JettyServer.java:24)
	at com.xxl.job.core.rpc.netcom.NetComServerFactory.start(NetComServerFactory.java:25)
	at com.xxl.job.core.executor.XxlJobExecutor.initExecutorServer(XxlJobExecutor.java:137)
	at com.xxl.job.core.executor.XxlJobExecutor.start(XxlJobExecutor.java:85)
	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.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1702)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1641)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
	... 57 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.util.thread.ThreadPool
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1352)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
	... 68 more

我使用的jar包：

<dependency>
	<groupId>com.xuxueli</groupId>
	<artifactId>xxl-job-core</artifactId>
	<version>1.9.2</version>
</dependency>

这个bug是jar包缺少对应的依赖导致的，添加对应jar包后解决此bug

<!-- jetty -->
<dependency>
	<groupId>org.eclipse.jetty</groupId>
	<artifactId>jetty-server</artifactId>
	<version>9.2.26.v20180806</version>
</dependency>
<dependency>
	<groupId>org.eclipse.jetty</groupId>
	<artifactId>jetty-util</artifactId>
	<version>9.2.26.v20180806</version>
</dependency>
<dependency>
	<groupId>org.eclipse.jetty</groupId>
	<artifactId>jetty-http</artifactId>
	<version>9.2.26.v20180806</version>
</dependency>
<dependency>
	<groupId>org.eclipse.jetty</groupId>
	<artifactId>jetty-io</artifactId>
	<version>9.2.26.v20180806</version>
</dependency>

<dependency>
	<groupId>com.caucho</groupId>
	<artifactId>hessian</artifactId>
	<version>4.0.51</version>
</dependency>

3.解决bug：`org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name ‘xxlJobExecutor’ defined in file [E:\workspace-idea\consult\target\RemoteConsult-0.0.1-SNAPSHOT\WEB-INF\classes\config\spring-xxl-job.xml]: Could not resolve placeholder ‘xxl.job.admin.addresses’ in string value “$xxl.job.admin.addresses";nestedexceptionisjava.lang.IllegalArgumentException:Couldnotresolveplaceholde{r}^{\prime }xxl.job.admin.addresse{s}^{\prime }instringvalue"${xxl.job.admin.addresses}”

`这个bug是使用了重复的property-placeholder，检测项目中的各种配置文件，发现出现重复扫描：

<context:property-placeholder location="classpath:config/global.properties" />

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="fileEncoding" value="utf-8"/>
        <property name="locations">
            <list>
                <value>classpath:xxl-job-executor.properties</value>
            </list>
        </property>
    </bean>

解决方法：
添加忽略即可：ignore-unresolvable=“true”，如下

<context:property-placeholder location="classpath:config/global.properties" ignore-unresolvable="true" />

总结：

导致踩坑的原因主要有两个：
1.xxl-job理解不到位，未注意相关的jar包依赖
2.老项目没用仔细看过，忽略了各种配置扫描件，特此留贴提醒