The Maven Integration requires that Eclipse be running in a JDK
he fully error message that you might get is as follows:
The Maven Integration requires that Eclipse be running in a JDK, because a number of Maven core plugins are using jars from the JDK. Please make sure the -vm option in eclipse.ini is pointing to a JDK and verify that Installed JREs are also using JDK installs.
To solve this problem add a new option into your eclipse.ini (which is located in your Eclipse installation folder):
-vm C:\Program Files\Java\jdk1.6.0_06\bin\javaw.exe
It is important to have this line on the correct location, otherwise Eclipse will have no clue about this setting:
-showsplash org.eclipse.platform --launcher.XXMaxPermSize 256M -vm C:\Program Files\Java\jdk1.6.0_06\bin\javaw.exe -vmargs -Dosgi.requiredJavaVersion=1.5 -Xms40m -Xmx512m
It has to be before the -vmargs argument.
在eclipse中安装了m2eclipse（maven插件）
在安装后，出现下列警告：
The Maven Integration requires that Eclipse be running in a JDK, because a number of Maven core plugins are using jars from the JDK.
Please make sure the -vm option in eclipse.ini is pointing to a JDK and verify that Installed JRE’s are also using JDK installs.
解决：
（1）set your JDK as a default Java environment in eclipse (default installed JRE)
Open eclipse. Click on ‘Window’ -> ‘Preferences’ -> ‘Java’ -> ‘Installed JREs’.
If you can’t find any JDK on the list -> click ‘Add’ -> ‘Standard VM’ -> set all paths and click ‘Finish’.
After that – check this JDK on the list of installed JREs and click ‘OK’.
（2）add path to your SDK in eclipse.ini
open ‘eclipse.ini’ and add there: -vm path_to_javaw_on_your_machine，so in my example it will be (jdk1.6.0_17 on Windows):
-vm
D:\\Java\jdk1.6.0_13\jre\bin\javaw
Notice 1: Do not use paths with spaces! Replace all dir names with spaces to their shortcuts. For example: ‘Program Files’ is ‘Progra~1′.
Notice 2: ‘-vm’ is in the first line, path is in the second line
your ‘eclipse.ini’ looks like this:
-startup
plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.0.200.v20090519
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
-vm
D:\Java\jdk1.6.0_13\jre\bin\javaw
-vmargs
-Xms40m
-Xmx256m
Notice : ‘-vm’ must be "-vmargs" above
Restart eclipse and everything should be fine.