2019正月初一排查maven无厘头问题

我不是女神ヾ 2022-04-23 09:14 84阅读 0赞

今天是2019年正月初一，看到另一个角度拍摄的，助理在众多“现场观众”的注视下，帮刘谦变更道具的魔术，无趣。还是按计划把我的微服务项目往前推进一下吧。

我的微服务项目包括几个module，服务注册、服务提供者、服务消费者、安全、配置中心、负载均衡、路由。已经编写完毕，现在需要打成jar包，用docker部署到CentOS。千山万水都过去了，居然在maven打包时出现点异常。

在module bill-recharge-facade 打包时，提示如下：

$ mvn clean package
    [INFO] Scanning for projects...
    [ERROR] [ERROR] Some problems were encountered while processing the POMs:
    [ERROR] Malformed POM D:\studies\billparent-all\bill-recharge-facade\pom.xml: expected START_TAG or END_TAG not TEXT (position: TEXT seen ...\n    <d... @18:7)  @ D:\studies\billparent-all\bill-recharge-facade\pom.xml, line 18, column 7
    [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-resources-plugin is missing. @ com.zkld.bill:billparent-all:1.0-SNAPSHOT, D:\studies\billparent-all\pom.xml, line 115, column 21
     @
    [ERROR] The build could not read 1 project -> [Help 1]
    [ERROR]
    [ERROR]   The project com.zkld.bill:bill-recharge-facade:1.0-SNAPSHOT (D:\studies\billparent-all\bill-recharge-facade\pom.xml) has 1 error
    [ERROR]     Malformed POM D:\studies\billparent-all\bill-recharge-facade\pom.xml: expected START_TAG or END_TAG not TEXT (position: TEXT seen ...\n    <d... @18:7)  @ D:\studies\billparent-all\bill-recharge-facade\pom.xml, line 18, column 7 -> [Help 2]
    [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/ProjectBuildingException
    [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/ModelParseException

pom.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>billparent-all</artifactId>
            <groupId>com.zkld.bill</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>bill-recharge-facade</artifactId>
          
        
        <dependencies>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-feign</artifactId>
                <version>1.4.3.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.46</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.8.1</version>
                <scope>compile</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.2</version>
                    <configuration>
                        
                        <configurationFile>generator_bill.xml</configurationFile>
                        <verbose>true</verbose>
                        <overwrite>true</overwrite>
                    </configuration>
                    <executions>
                        <execution>
                            <id>Generate MyBatis Artifacts</id>
                            <goals>
                                <goal>generate</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.mybatis.generator</groupId>
                            <artifactId>mybatis-generator-core</artifactId>
                            <version>1.3.2</version>
                        </dependency>
    
                        <dependency>
                            <groupId>mysql</groupId>
                            <artifactId>mysql-connector-java</artifactId>
                            <version>5.1.46</version>
                        </dependency>
    
                    </dependencies>
                </plugin>
            </plugins>
    
        </build>
    
    </project>

在idea中打开pom.xml，有如下报错：

Element 'project' cannot have character [children], because the type's content type is element-only.

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg_size_16_color_FFFFFF_t_70][]![pom.xml][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg_size_16_color_FFFFFF_t_70 1][]

结合maven命令行的提示，判断是pom.xml中有无素没有关闭，即要么没有开始，要么没有结束。逐个查每个元素，未见异常。很有可能是有特殊字符，给我们显示了空白符。经查pom.xml也是utf-8编码。对于此类无厘头的问题，通常有三个办法解决

1、新建一个空白的pom.xml，毫无保留的逐个字符再敲一遍进去，千万不要拷贝，因为你拷进去的代码可能包含了伪装的特殊字符。

2、分块查找法快速定位（找一个可以正常使用的pom.xml），逐块拷贝，采用类似二分查找法，快速定位问题。千万不要丢下原始pom.xml的任何一个字符不替换。否则找不到问题在哪块代码。

3、对于字符编码类的问题，还有一个简便的排查方法，即直接用记事本打开pom.xml，以ANSI编码保存，直接让“空白字符”现了原形。

对本例，我采用第3个办法，将pom.xml，以ANSI编码保存后，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>billparent-all</artifactId>
            <groupId>com.zkld.bill</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>bill-recharge-facade</artifactId>
        ??
        
        <dependencies>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-feign</artifactId>
                <version>1.4.3.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.46</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.8.1</version>
                <scope>compile</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.2</version>
                    <configuration>
                        
                        <configurationFile>generator_bill.xml</configurationFile>
                        <verbose>true</verbose>
                        <overwrite>true</overwrite>
                    </configuration>
                    <executions>
                        <execution>
                            <id>Generate MyBatis Artifacts</id>
                            <goals>
                                <goal>generate</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.mybatis.generator</groupId>
                            <artifactId>mybatis-generator-core</artifactId>
                            <version>1.3.2</version>
                        </dependency>
    
                        <dependency>
                            <groupId>mysql</groupId>
                            <artifactId>mysql-connector-java</artifactId>
                            <version>5.1.46</version>
                        </dependency>
    
                    </dependencies>
                </plugin>
            </plugins>
    
        </build>
    
    </project>

就是它！位于<artifactId>bill-recharge-facade</artifactId>之后的两个问号单独占了一行（第13行）。可能是打汉字时，不小心输入的两个全角空格。肯定是非法的。删除后，问题解决。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190205170518439.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg==,size_16,color_FFFFFF,t_70
[pom.xml]: https://img-blog.csdnimg.cn/20190205170547486.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlbmRlcg_size_16_color_FFFFFF_t_70 1]: /images/20220321/e15ec3e976bc4bf3a1f60d1cba7e1d02.png