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Editor to share with you what are the problems of maven in eclipse, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Unrecognised tag

problem

Because I use the local proxy repository, the settings.xml settings are as follows:

NexusnexusNexus http://localhost:8081/nexus/content/groups/publictruetruenexusNexus http://localhost:8081/nexus/content/groups/publictruetrue nexus

However, the following exception was found in the Maven compilation Times:

[WARNING] Some problems were encountered while building the effective settings

[WARNING] Unrecognised tag: 'activeProfiles' (position: START_TAG seen.\ n\ t. @ 269 Administrator.ZQFGROUP.000 18) @ C:\ Documents and Settings\ Administrator.ZQFGROUP.000\ .m2\ settings.xml, line 269, column 18

[WARNING]

Solve

This is because activeProfiles is configured in the profiles node by mistake. ActiveProfiles should be moved outside the profiles. For more settings.xml configuration information, please see here.

No goals

problem

After Eclipse has installed the Maven plug-in, right-click on the pom.xml of the project to see the following:

And I wisely thought that Maven build and mvn compile were equivalent, so I clicked on "Maven build..." again. After that, the "Goals" is empty, such as:

So he reported the following mistake:

[ERROR] No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format:or: [:]:. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-site, site, post-site, site-deploy, pre-clean, clean, post-clean. -> [Help 1]

Solve

There are at least two solutions:

Click "Maven build..." again After that, enter the "Goals" you want to execute, such as compile,clean,test, etc.

Configure the default Goal in pom.xml, such as:

Clean

As a child node of project.

Not a JRE

problem

When configuring the default Goal using pom.xml, it is OK if the default Goal is clean, but if it is as follows:

An error will be reported:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure

[ERROR] Unable to locate the Javac Compiler in:

[ERROR] C:\ Program Files\ Java\ jre7\..\ lib\ tools.jar

[ERROR] Please ensure you are using JDK 1.4 or above and

[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).

[ERROR] In most cases you can change the location of your Java

[ERROR] installation by setting the JAVA_HOME environment variable.

After several attempts, it was found that it was not the problem of multiple Goal, but the problem of compile Goal. But the "mvn compile" that uses the command is also OK.

After several twists and turns, I found that the error said very clearly: "Please ensure you are using JDK 1.4 or above and not a JRE", it needs JDK instead of JRE. I gave the project to use public JRE:

Solve

Modify the configuration of Eclipse by using JDK:Eclipse- > Window- > Preferences- > Java- > Installed JREs

System propery is not set

Error:-Dmaven.multiModuleProjectDirectory system propery is not set.

Create a new environment variable M2_HOME that points to your maven installation directory

M2_HOME=D:\ study\ apache-maven-3.3.3

Then go to Window- > Preference- > Java- > Installed JREs- > Edit

Set up in Default VM arguments

-Dmaven.multiModuleProjectDirectory=$M2_HOME

5. Launching New_configuration

Right-click on the project-> Run/Debug Settings- > delete new_Configuration.

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