maven build

I am using maven as a build for the project
turbine/torque/velocity
I just upgraded jdk from 1.4 to 1.5. But the build failed.
Is there any suggestions to fix it?

Thanks a lot.
Jill

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Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:>cd sourcecode/neo-master/neo

C:sourceCodeneo-masterneo>maven
 __  __
|  /  |__ _Apache__ ___
| |/| / _`  V / -_) '   ~ intelligent projects ~
|_|  |___,_|_/___|_||_|  v. 1.0-rc1-SNAPSHOT

war:init:
java:prepare-filesystem:

java:compile:
    [echo] Compiling to
C:sourceCodeneo-masterneo/target/classes
    [javac] Compiling 4 source files to
C:sourceCodeneo-masterneotargetclasses
javac: target release 1.1 conflicts with default source
release 1.5

BUILD FAILED
File...... file:/C:/Documents and
Settings/jhan.BLR/.maven/plugins/maven-java-pl
ugin-1.3/
Element... ant:javac
Line...... 34
Column.... 48
Compile failed; see the compiler error output for details.
Total time: 11 seconds
Finished at: Thu Oct 12 12:58:15 CDT 2006
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