Common Errors and solutions before using maven in myeclipse, myeclipsemaven

Common Errors and solutions before using maven in myeclipse, myeclipsemaven

1. jdk and jre

(Error: java. lang. UnsupportedClassVersionError: Unsupported major. minor version 51.0)

Jre applicable to windows-preferences-java-Installed JREs Add

Windows-preferences-java-compiler Compiler compliance level: changed to the same version as the previous version.

Right-click the project-properties-java compiler Compiler compliance level: changed to a version consistent with the previous version.

Right-click the project-properties-java builde path-add library-JRE System Library y and use the same JRE

2. An error is reported:-Dmaven. multiModuleProjectDirectory system propery is not set. Check $ M2_HOME environment variable and mvn script match.

Solution: You can set an environment variable M2_HOME to point to your maven installation directory.

M2_HOME = D: \ Apps \ apache-maven-3.3.1

Then, in Window-> Preference-> Java-> Installed JREs-> Edit

In Default VM arguments, set-Dmaven. multiModuleProjectDirectory = $ M2_HOME

3. Error:Java compiler level does not match the version of the installed java project facet

Solution: Find the directory of the project and open the org. eclipse. wst. common. project. facet. core. xml configuration file in the. settings subdirectory.

Change version <installed facet = "java" version = "1.7"/>