【maven 报错】maven项目执行maven install时报错Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)

在使用maven新建的web项目中，执行

执行如上的这两个操作，报错：

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project bioligyInfo: Fatal error compiling: tools.jar not found: C:Program FilesJavajre1.8.0_73..lib	ools.jar -> [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/MojoExecutionException





[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project bioligyInfo: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [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/MojoExecutionException

上面的两种错误，提示的很明显：

错误1：

其实不用从maven下载插件，只需要保证你的pom.xml文件中有如下的信息即可：

 <build>
      <plugins>
          <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <configuration>
                  <version>2.5</version>
              </configuration>
          </plugin>
      </plugins>
  </build>
  
  <properties>                                                                                                
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>                                  
       <spring.version>4.1.4.RELEASE</spring.version>                                                      
       <hibernate.version>4.3.8.Final</hibernate.version>                                                  
       <jackson.version>2.5.0</jackson.version>                                                            
                                                                                                           
   </properties>  

错误2：

 提示找不到web.xml文件

解决方法：

1》如果你没有配置web.xml文件，那就创建web.xml文件

2》如果你配置了web.xml文件，还有这样的错误，那就是你的web.xml文件不能被你项目读取到

如下，项目中web.xml的位置如下：

而我们需要让项目读取到它：

因为web.xml文件的路径如下：srcmainwebappWEB-INFweb.xml

如果依旧无法解决，那就在pom.xml文件中配置如下：

  <build>
      <plugins>
          <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <configuration>
                  <version>2.5</version>
              <webXml>srcmainwebappWEB-INFweb.xml</webXml>
              </configuration>
          </plugin>
      </plugins>
  </build>

这样指定到具体的文件上  就可以解决这问题了。