Maven - Why after "mvn clean" I need to execute "Maven Update Project" before "mvn package"?

eclipse maven maven-3 maven-plugin pom.xml

41,810

Solution 1

Here is what happens:

mvn clean deletes the target directory
mvn package performs some work, but then encounters a compilation error due to a missing dependency. That's why the target folder is in error.
Running Maven > Update Project in Eclipse causes Eclipse to perform its own compilation, separate from Maven. Eclipse has a different classpath than Maven, so its compilation succeeds. Now the target directory has all the compiled classes.
Re-running mvn package now succeeds, because it finds all the classes already compiled and doesn't need to perform any compilation.

Ultimately, the problem is in the project configuration in pom.xml. I had the same problem, and after adding the missing dependency I successfully compiled project with Maven.

Solution 2

The Eclipse m2e plugin (this is a simplification) reads the POM file and translates it into instructions for Eclipse so that Eclipse can do its thing. Because Eclipse is in control the whole time, your view gets updated correctly and things are pretty smooth. Some more advanced Maven actions with plugins are not supported by m2e, and so those actions just won't happen. Some simple stuff, like the classpath is different from how Maven does things -- m2e uses the "test" classpath no matter what because Eclipse can't predict what you'll want to run.

On the other hand, performing "Run as > Maven ..." actually calls Maven, a program completely outside of Eclipse, and asks it to run. Eclipse doesn't automatically know when files have been created or deleted by Maven.

I would generally stay away from the "Run as > Maven" commands. The integration is poor, the Eclipse console interface is ugly, it's just easier to call mvn from the command line if you need to run specific Maven goals.

If you just want to develop a Maven project, I find the m2e integration works very well. I use Jenkins to handle the packaging and deployment for me, so I'm only using Eclipse to edit and test my code.

41,810

Author by

Pmt

Java developer.

Updated on December 30, 2020

Comments

Pmt over 3 years

I'm making some tests and I would like to understand why after execute the command mvn clean I need to execute "Maven > Update Project" before run mvn package, otherwise I get a compilation error in one of my dependencies during the packaging.

It looks like my project doesn't compile correctly my project before running "Maven > Update Project", but I'm not sure. Is this normal?

I'm using Eclipse and run the commands {mvn clean} and {mvn package} via "Run as > Maven Build".

Here is my 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>com.project</groupId>
    <artifactId>myProject</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <jmockit.version>0.0.1</jmockit.version>
    </properties>

    <build>
        <testSourceDirectory>src/test/java/junit</testSourceDirectory>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </resource>
        </resources>

        <testResources>
            <testResource>
                <directory>src/test/java/selenium</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </testResource>
        </testResources>

        <pluginManagement>
            <plugins>
                <!-- Need Java 5, which is the default since v2.3 of the maven-compiler-plugin. -->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>2.5.1</version>
                </plugin>
            </plugins>
        </pluginManagement>

        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                    <warSourceExcludes>src/main/resources/conf_development</warSourceExcludes>
                    <webResources>
                        <resource>
                            <directory>src/main/resources/conf_production</directory>
                            <targetPath>WEB-INF/classes/</targetPath>
                            <includes>
                                <include>**/*</include>
                            </includes>
                        </resource>
                        <resource>
                            <directory>src/main/resources/conf</directory>
                            <targetPath>WEB-INF/classes/</targetPath>
                            <includes>
                                <include>**/*</include>
                            </includes>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <argLine>
                        -javaagent:"${settings.localRepository}"/mockit/jmockit/${jmockit.version}/jmockit-${jmockit.version}.jar
                    </argLine>
                </configuration>
            </plugin>
        </plugins>
    </build>


<dependencies>
    <dependency>
        <groupId>asm</groupId>
        <artifactId>asm</artifactId>
        <version>1.5.3</version>
    </dependency>
    <dependency>
        <groupId>bouncycastle</groupId>
        <artifactId>bcprov-jdk14</artifactId>
        <version>140</version>
    </dependency>
    <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1</version>
    </dependency>
    <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0-oracle-thin-extras</artifactId>
        <version>0.9.0.2</version>
    </dependency>
    <dependency>
        <groupId>commons-betwixt</groupId>
        <artifactId>commons-betwixt</artifactId>
        <version>0.7</version>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>1.4</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-email</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>net.sf.ehcache</groupId>
        <artifactId>ehcache-core</artifactId>
        <version>2.4.2</version>
    </dependency>
    <dependency>
        <groupId>com.googlecode.ehcache-spring-annotations</groupId>
        <artifactId>ehcache-spring-annotations</artifactId>
        <version>1.1.3</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-annotations</artifactId>
        <version>3.4.0.GA</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>3.4.0.GA</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.3.2.GA</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.1.2</version>
    </dependency>
    <dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib</artifactId>
        <version>2.4</version>
        <type>pom</type>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>2.5.6</version>
    </dependency>
    <dependency>
        <groupId>net.fckeditor</groupId>
        <artifactId>java-core</artifactId>
        <version>2.4</version>
    </dependency>
    <dependency>
        <groupId>backport-util-concurrent</groupId>
        <artifactId>backport-util-concurrent</artifactId>
        <version>3.1</version>
    </dependency>
    <dependency>
        <groupId>com.oracle</groupId>
        <artifactId>ojdbc14</artifactId>
        <version>10.2.0.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.ibm.icu</groupId>
        <artifactId>icu4j</artifactId>
        <version>3.8</version>
    </dependency>
    <dependency>
        <groupId>mockit</groupId>
        <artifactId>jmockit</artifactId>
        <version>${jmockit.version}</version>
    </dependency>
    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.0</version>
    </dependency>
    <dependency>
        <groupId>com.lowagie</groupId>
        <artifactId>itext</artifactId>
        <version>2.1.0</version>
    </dependency>
    <dependency>
        <groupId>atg.taglib.json</groupId>
        <artifactId>json-taglib</artifactId>
        <version>0.4.1</version>
    </dependency>
    <dependency>
        <groupId>commons-httpclient</groupId>
        <artifactId>commons-httpclient</artifactId>
        <version>3.1</version>
    </dependency>
    <dependency>
        <groupId>net.sourceforge.jexcelapi</groupId>
        <artifactId>jxl</artifactId>
        <version>2.6</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-all</artifactId>
        <version>1.8.5</version>
    </dependency>
    <dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
        <version>1.8.4</version>
    </dependency>
    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-server</artifactId>
        <version>2.25.0</version>
        <type>pom</type>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring</artifactId>
        <version>2.5.6.SEC03</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-agent</artifactId>
        <version>2.5.6.SEC03</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>2.5.6.SEC03</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-config-browser-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-convention-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-core</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-jasperreports-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-jfreechart-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-json-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-spring-plugin</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity</artifactId>
        <version>1.6.3</version>
    </dependency>
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity-tools</artifactId>
        <version>1.3</version>
    </dependency>
    <dependency>
        <groupId>com.yahoo.platform.yui</groupId>
        <artifactId>yuicompressor</artifactId>
        <version>2.4.6</version>
    </dependency>
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.5</version>
    </dependency>
    <dependency>
        <groupId>net.sf.jodreports</groupId>
        <artifactId>jodreports</artifactId>
        <version>2.4.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>1.5.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-ws-core</artifactId>
        <version>1.5.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-oxm-tiger</artifactId>
        <version>1.5.9</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-ws-core-tiger</artifactId>
        <version>1.5.9</version>
    </dependency>
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-xjc</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ws.commons.axiom
        </groupId>
        <artifactId>axiom-api</artifactId>
        <version>1.2.5</version>
    </dependency>
    <dependency>
        <groupId>org.apache.ws.commons.axiom
        </groupId>
        <artifactId>axiom-impl</artifactId>
        <version>1.2.5</version>
    </dependency>
    <dependency>
        <groupId>javax.xml</groupId>
        <artifactId>jaxrpc-api</artifactId>
        <version>1.1</version>
    </dependency>
    <dependency>
        <groupId>org.seleniumhq.selenium.client-drivers</groupId>
        <artifactId>selenium-java-client-driver</artifactId>
        <version>1.0.1</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
    </dependency>
    <dependency>
        <groupId>org.acegisecurity</groupId>
        <artifactId>acegi-security</artifactId>
        <version>1.0.7</version>
    </dependency>
    <dependency>
        <groupId>citizen</groupId>
        <artifactId>citizen</artifactId>
        <version>citizen</version>
    </dependency>
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.4</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>jasperreports</groupId>
        <artifactId>jasperreports</artifactId>
        <version>3.5.3</version>
    </dependency>
</dependencies>
</project>

The error:

(Remembering that the lib with error it's an internal lib and it work just fine after "Maven > Update Project")

[INFO] Compiling 2595 source files to C:\Users\user\Documents\Dev\workspace\project\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] C:\Users\user\Documents\Dev\workspace\project\src\main\java\com\project\jobs\citizen\model\service\CitizenService.java:[38
,34] cannot access org.apache.axis.client.Service
class file for org.apache.axis.client.Service not found
        Resolution2Locator r2 = new Resolution2Locator ();
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2:09.448s
[INFO] Finished at: Fri Mar 22 11:55:14 BRT 2013
[INFO] Final Memory: 25M/274M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project project: Compilation failure
[ERROR] C:\Users\user\Documents\Dev\workspace\project
\src\main\java\com\project\jobs\citizen\model\service\CitizenService.java:[38
,34] cannot access org.apache.axis.client.Service
[ERROR] class file for org.apache.axis.client.Service not found
[ERROR] Resolution2Locator r2 = new Resolution2Locator();
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project u
nico: Compilation failure
C:\Users\user\Documents\Dev\workspace\project\src\main\java\com\project\jobs\citizen\model\service\CitizenService.java:[38,34] can
not access org.apache.axis.client.Service
class file for org.apache.axis.client.Service not found
        Resolution2Locator r2 = new Resolution2Locator ();

    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
C:\Users\user\Documents\Dev\workspace\project\src\main\java\com\project\jobs\citizen\model\service\CitizenService.java:[38,34] can
not access org.apache.axis.client.Service
class file for org.apache.axis.client.Service not found
        Resolution2Locator r2 = new Resolution2Locator ();

    at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:729)
    at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:128)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more
[ERROR] 
[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

Pmt about 11 years

But why the command mvn package work? And there isn't any updates to be done, just rebuild the project.
Pmt about 11 years

Thanks a lot for the explanation!! The idea it's to run it with Jenkins to, but until the migration isn't done, we will need to execute those commands locally. Unfortunately the same error occurs when I execute mvn clean directly from prompt. Do you have any idea of what I should do? Thanks again.
Nathaniel Waisbrot about 11 years

@PimentaDev. what is the error that you see when you run mvn clean?
Pmt about 11 years

mvn clean it's running fine. The problem it's mvn package after that. One of my libs get a compilation error, but I don't know why. The error only stops if I open Eclipse and run "Maven > Update Project"!
Pmt about 11 years

Just added this dependency and everything worked! Thanks a lot! <dependency> <groupId>org.apache.axis</groupId> <artifactId>axis</artifactId> <version>1.4</version> </dependency>
Greg Chabala almost 11 years

These sound like great reasons to stay away from Eclipse. IntelliJ has no problems letting Maven run the build.
Nathaniel Waisbrot almost 11 years

@GregChabala For projects where you need to do something complex or strange with Maven, then I wouldn't recommend Eclipse. But for a user already familiar with Eclipse who just needs to be able to clean and build a project, m2e is pretty great.
Hartmut Pfarr over 8 years

Nicely explained, very helpful! Thank You