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Dubbo Monitor: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1

Dubbo Monitor:
打包mvn package -Dmaven.test.skip=true
错误信息如下：

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/zhuangjinxin/Projects/Dubbo/dubbo-master/dubbo-simple/dubbo-monitor-simple/src/main/java/com/alibaba/dubbo/monitor/simple/RegistryContainer.java:[212,64] cannot access org.springframework.context.support.ClassPathXmlApplicationContext
  class file for org.springframework.context.support.ClassPathXmlApplicationContext not found
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.123 s
[INFO] Finished at: 2017-02-23T12:45:16+08:00
[INFO] Final Memory: 22M/295M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project dubbo-monitor-simple: Compilation failure
[ERROR] /Users/zhuangjinxin/Projects/Dubbo/dubbo-master/dubbo-simple/dubbo-monitor-simple/src/main/java/com/alibaba/dubbo/monitor/simple/RegistryContainer.java:[212,64] cannot access org.springframework.context.support.ClassPathXmlApplicationContext
[ERROR] class file for org.springframework.context.support.ClassPathXmlApplicationContext not found
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

java.lang.NoClassDefFoundError: org/springframework/boot/context/embedded/ServletRegistrationBean

在Spring Boot整合CXF webservice时，出现如下错误：

java.lang.NoClassDefFoundError: org/springframework/boot/context/embedded/ServletRegistrationBean
	at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_111]
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_111]
	at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_111]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613) ~[spring-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:524) ~[spring-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:510) ~[spring-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:570) ~[spring-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:697) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:640) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1484) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:425) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:395) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
	at sample.ws.WsApplicationStart.main(WsApplicationStart.java:10) [main/:na]
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.context.embedded.ServletRegistrationBean
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_111]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_111]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_111]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_111]
	... 23 common frames omitted

此时build.gradle配置情况如下：

dependencies {
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '1.5.2.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-web-services', version: '1.5.2.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '1.5.2.RELEASE'
    compile group: 'org.apache.cxf', name: 'cxf-spring-boot-starter-jaxws', version: '3.1.10'
    testCompile group: 'junit', name: 'junit', version: '4.11'
}

Gradle把项目打成jar包，并添加到本地Maven仓库

问题起因：
Dubbo服务生产者(Provider)提供服务，服务消费者(Consumer)作为Web Service层调用Service层的服务，Web Service 与Service分成两个项目分别部署。

解决思路：
服务层通过API的方式暴露服务，把服务的API打包成jar文件。Service层实现服务API，Web Service层通过API调用服务。

如何使用Gradle把服务的API打包成jar文件，并放入本地的.m2仓库中，方便Service层和Web Service层添加依赖。

服务API项目的build.gradle文件中添加如下内容，并使用gradle install完成打包和添加到仓库

install  {
    repositories.mavenInstaller {
        pom.groupId = "com.zhuangjinxin.dubbo.service"
        pom.artifactId = "service-api"
        pom.version = "1.0.0"
    }
}

Service层和Web Service层在各自的build.gradle文件中添加依赖：

dependencies {
    compile group:'com.zhuangjinxin.dubbo.service',name:'service-api',version:'1.0.0'
}

如何解决Bean校验时，接口参数首字母大写与Bean属性首字母小写不匹配的问题

问题背景：

系统重构时，由于历史原因对外提供的接口文档参数都是大写字母开头。比如：

{
    "UserNmae":"zhuangjinxin",
    "Password":"123456"
}
注意：参数的首字母都是大写的。UserName的U，Password的P。

接收请求的处理方式：

@RestController
public class UserController {

    @RequestMapping("/user")
    public void userLogin(@RequestBody User user){}
}
注：为什么把参数校验放在实体类User里面，而不是直接放在userLogin()方法的括号内作为参数传进来？
1. 接口对外暴露的时候，规定传JSON格式的数据；
2. 接口参数非常多，如果都写在userLogin()方法的括号内，代码非常乱；

User实体类：

public class User {
    private String userName;
    private String password;

... setter and getter
}
注意：实体类User里的属性都是小写字母开头的。userName的u，password的p。

这种情况下，调用者传入的JSON格式的数据始终对应不上User实体类的属性值，User实体类中的userName和password一直是null；

解决办法

在User的属性上加上注解@JsonProperty(value = "")，这样就能接收接口调用者传入的大写参数字段的值。还有一点好处，如果返回实体类User时，又回自动转换成大写参数返回给接口调用者。

import com.fasterxml.jackson.annotation.JsonProperty;

public class User {

    @JsonProperty(value = "UserName")
    private String userName;

    @JsonProperty(value = "Password")
    private String password;

... setter and getter
}

🔗 项目链接：https://github.com/zhuangjinxin/spring-boot-samples/blob/master/spring-boot-sample-validation

Could not load JDBC driver class: com.mysql.jdbc.Driver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

日志记录到数据库：
logback-spring.xml

<appender name="db" class="ch.qos.logback.classic.db.DBAppender">
    <connectionSource class="ch.qos.logback.core.db.DriverManagerConnectionSource">
         <driverClass>com.mysql.jdbc.Driver</driverClass>
         <url>jdbc:mysql://*.*.*.*:3306/database</url>
         <user>user</user>
         <password>password</password>
    </connectionSource>
</appender>
<root level="INFO">
     <appender-ref ref="db" />
</root>

引入MySQL JDBC驱动包：
build.gradle

dependencies {
    compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.5'
}

启动报错：

Exception in thread "main" java.lang.IllegalStateException: java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.db.DriverManagerConnectionSource@232a7d73 - Could not load JDBC driver class: com.mysql.jdbc.Driver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
ERROR in ch.qos.logback.core.joran.spi.Interpreter@19:20 - RuntimeException in Action for tag [appender] java.lang.IllegalStateException: DBAppender cannot function if the JDBC driver does not support getGeneratedKeys method *and* without a specific SQL dialect
	at org.springframework.boot.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:315)
	at org.springframework.boot.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:276)
	at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:239)
	at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:212)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:73)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:336)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)
	at com.lakala.mfs.boot.ApplicationStarter.main(ApplicationStarter.java:23)

SLF4J: Class path contains multiple SLF4J bindings.

SpringBoot+Dubbo+Gradle 构建分布式微服务架构

build.gradle依赖关系：

dependencies {
    compile group: 'org.springframework.boot', name: 'spring-boot-starter', version: '1.5.1.RELEASE'
    compile (group: 'com.alibaba', name: 'dubbo', version: '2.5.3'){
        exclude group: 'org.springframework',module:'spring'
    }
    compile (group: 'org.apache.zookeeper', name: 'zookeeper', version: '3.4.9'){
        exclude group: 'org.slf4j',module:'slf4j-log4j12'
        exclude group: 'log4j',module:'log4j'
        exclude group: 'org.slf4j',module:'slf4j-api'
    }
    compile (group: 'com.101tec', name: 'zkclient', version: '0.10'){
        exclude group: 'org.slf4j',module:'slf4j-api'
    }
}

运行项目，有如下警告：

objc[6367]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/bin/java (0x10275d4c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x1027f44e0). One of the two will be used. Which one is undefined.
Connected to the target VM, address: '127.0.0.1:58118', transport: 'socket'
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/zhuangjinxin/.m2/repository/ch/qos/logback/logback-classic/1.1.9/logback-classic-1.1.9.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/zhuangjinxin/.m2/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

JDK版本导致的出错问题

编译出问题：

process.setReturncode(o.getContext().getModel("_ReturnCode"));
process.setReturnmsg(o.getContext().getModel("_ReturnMsg"));

Base64 Gradle Build编译不过去

执行gradle clean,gradle build编译报错：

error: package com.sun.org.apache.xml.internal.security.utils does not exist
import com.sun.org.apache.xml.internal.security.utils.Base64;
                                                     ^

但：右键‘RUN’ 能够启动程序并编译过去

The POM for com.alibaba:dubbo:jar:2.5.4-SNAPSHOT is missing, no dependency information available

当前系统环境：

  • JDK版本：1.8.0.111
  • Maven版本：3.9.9

Github上下载最新版的Dubbo，进入dubbo-admin目录执行打包命令：
mvn package -Dmaven.test.skip=true

报错信息：

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10.230 s
[INFO] Finished at: 2017-02-22T20:14:31+08:00
[INFO] Final Memory: 10M/133M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project dubbo-admin: Could not resolve dependencies for project com.alibaba:dubbo-admin:war:2.5.4-SNAPSHOT: Could not find artifact com.alibaba:dubbo:jar:2.5.4-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

Cannot determine embedded database driver class for database type NONE

程序启动失败，报如下错误：

***************************
APPLICATION FAILED TO START
***************************

Description:
Cannot determine embedded database driver class for database type NONE

Action:
If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).

SpringBoot接口参数校验

问题起源：
选用SpringBoot来做为微服务框架，如何对传入接口的参数进行‘是否合法’的校验？目前了解到的Validator的用法：每个接口对应一个实体Bean，接口的参数对用Bean的属性，通过在属性上使用@null、@NotNull等注解来完成校验。但是，这种方法的缺点是需要生成大量的实体类！还有没有更方便的解决办法？

Could not find ojdbc14.jar (com.oracle:ojdbc14:10.2.0.4.0)

集成Oracle数据源，添加Oracle JDBC依赖：

dependencies {
      compile group: 'com.oracle', name: 'ojdbc14', version: '10.2.0.4.0'
}

刷新依赖，出现如下警告⚠️

Warning:
root project '***': Unable to resolve additional project configuration.
Details: org.gradle.api.artifacts.ResolveException: Could not resolve all dependencies for configuration ':com.***.***.boot:compileClasspath'.
Caused by: org.gradle.internal.resolve.ArtifactNotFoundException: Could not find ojdbc14.jar (com.oracle:ojdbc14:10.2.0.4.0).
Searched in the following locations:
http://repo.spring.io/libs-snapshot/com/oracle/ojdbc14/10.2.0.4.0/ojdbc14-10.2.0.4.0.jar

Warning:
project ':com.***.***.boot': Unable to resolve additional project configuration.
Details: org.gradle.api.artifacts.ResolveException: Could not resolve all dependencies for configuration ':com.***.***.boot:compileClasspath'.
Caused by: org.gradle.internal.resolve.ArtifactNotFoundException: Could not find ojdbc14.jar (com.oracle:ojdbc14:10.2.0.4.0).
Searched in the following locations:
http://repo.spring.io/libs-snapshot/com/oracle/ojdbc14/10.2.0.4.0/ojdbc14-10.2.0.4.0.jar

Warning:
root project '***': Unable to resolve additional project configuration.
Details: org.gradle.api.artifacts.ResolveException: Could not resolve all dependencies for configuration ':com.***.***.boot:compileClasspath'.
Caused by: org.gradle.internal.resolve.ArtifactNotFoundException: Could not find ojdbc14.jar (com.oracle:ojdbc14:10.2.0.4.0).
Searched in the following locations:
http://repo.spring.io/libs-snapshot/com/oracle/ojdbc14/10.2.0.4.0/ojdbc14-10.2.0.4.0.jar

Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined

启动程序警告⚠️，并不影响程序正常启动。警告如下：

objc[9709]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/bin/java (0x1041bb4c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x1042d24e0). One of the two will be used. Which one is undefined.
Connected to the target VM, address: '127.0.0.1:49832', transport: 'socket'

记录交易日志到数据库

问题背景：

系统重构需要添加http请求日志记录到数据库的功能，以方便查询交易记录。要求每一条记录中包含请求的IP、请求方法（GET/POST）、请求参数、返回数据等。接口请求报文格式为JSON。

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