maven - m2eclipse 编译失败

Question

当我从命令行运行“mvn site”(使用 far manageR)时，一切都很好，它将所有必要的 jar 下载到存储库并执行任务。

但是，当我尝试使用 m2eclipse 插件从 Eclipse 执行相同操作(mvn 站点)时，它会显示给我:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building jdbc_maven 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ jdbc_maven ---
[debug] execute contextualize
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.0:compile (default-compile) @ jdbc_maven ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 7 source files to G:\workspace\jdbc_maven\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[8,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[13,16] error: cannot find symbol
[ERROR]   symbol:   class Logger
  location: class JdbcRoleDao
G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[5,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[28,16] error: cannot find symbol
[ERROR]   symbol:   class Logger
  location: class User
G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[13,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[19,16] error: cannot find symbol
[ERROR]   symbol:   class Logger
  location: class JdbcUserDao
G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[13,29] error: cannot find symbol
[ERROR]   symbol:   variable Logger
  location: class JdbcRoleDao
G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[28,29] error: cannot find symbol
[ERROR]   symbol:   variable Logger
  location: class User
G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[19,29] error: cannot find symbol
[INFO] 9 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.387s
[INFO] Finished at: Sat Feb 16 11:05:13 EET 2013
[INFO] Final Memory: 7M/154M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project jdbc_maven: Compilation failure: Compilation failure:
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[8,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[13,16] error: cannot find symbol
[ERROR] symbol:   class Logger
[ERROR] location: class JdbcRoleDao
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[5,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[28,16] error: cannot find symbol
[ERROR] symbol:   class Logger
[ERROR] location: class User
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[13,23] error: package org.apache.log4j does not exist
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[19,16] error: cannot find symbol
[ERROR] symbol:   class Logger
[ERROR] location: class JdbcUserDao
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcRoleDao.java:[13,29] error: cannot find symbol
[ERROR] symbol:   variable Logger
[ERROR] location: class JdbcRoleDao
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\User.java:[28,29] error: cannot find symbol
[ERROR] symbol:   variable Logger
[ERROR] location: class User
[ERROR] G:\workspace\jdbc_maven\src\main\java\com\nixsolutions\JdbcUserDao.java:[19,29] error: cannot find symbol

这是我的 pom.xml

<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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>jdbc_maven</groupId>
    <artifactId>jdbc_maven</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>jdbc_maven</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.dbunit</groupId>
            <artifactId>dbunit</artifactId>
            <version>2.4.8</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.6.4</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.4</version>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.3.169</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.jms</groupId>
                    <artifactId>jms</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jmx</groupId>
                    <artifactId>jmxri</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sun.jdmk</groupId>
                    <artifactId>jmxtools</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>

    <build>
        <plugins>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-site-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <reportPlugins>
                        <plugin> 
                            <groupId>org.apache.maven.plugins</groupId> 
                            <artifactId>maven-surefire-report-plugin</artifactId> 
                            <version>2.8</version> 
                        </plugin> 
                        <plugin> 
                            <groupId>org.apache.maven.plugins</groupId> 
                            <artifactId>maven-checkstyle-plugin</artifactId> 
                            <version>2.6</version> 
                            <configuration> 
                                <configLocation>sun_checks.xml</configLocation> 
                            </configuration> 
                        </plugin> 
                        <plugin> 
                            <groupId>org.apache.maven.plugins</groupId> 
                            <artifactId>maven-javadoc-plugin</artifactId> 
                            <version>2.6.1</version> 
                        </plugin> 
                    </reportPlugins>
                </configuration>
            </plugin>


            <!-- JDK 1.7 COMPILER - DON'T TOUCH -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <showDeprecation>true</showDeprecation>
                    <showWarnings>true</showWarnings> 
                    <executable>${env.JAVA_HOME}/bin/javac</executable>
                    <fork>true</fork> 
                </configuration>
            </plugin>
            <!-- JDK 1.7 COMPILER - DON'T TOUCH -->

        </plugins>
    </build>

</project>

Answer 1

m2eclipse 有时会发生这种情况，这是因为当您向 pom.xml 添加新的依赖项时，m2e 会自动将其添加到类路径中，并且此类路径生成存在一些问题。

一个快速而肮脏的修复方法是

Remove the project from the eclipse

现在 navigate to the project folder和 delete .settings directory and .classpath file

Import the project into the eclipse作为“Maven 项目”