[1.7.10] ForgeGradle and lambda expressions

[RedEnergy]

Hello, i tried to build my mod using Forge Gradle but got this error. I tried to add these lines to build.gradle

targetCompatibility = '1.8'
sourceCompatibility = '1.8'

, but it didn't help. Is there any way to solve this problem? My gradle version is:

> gradlew --version

------------------------------------------------------------
Gradle 2.0
------------------------------------------------------------

Build time:   2014-07-01 07:45:34 UTC
Build number: none
Revision:     b6ead6fa452dfdadec484059191eb641d817226c

Groovy:       2.3.3
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.8.0_45 (Oracle Corporation 25.45-b02)
OS:           Windows 7 6.1 amd64

[Failender]

Correct me if I am wrong, but minecraft isnt coded in 1.8, so you cant use lambda expressions.

[RedEnergy]

Correct me if I am wrong, but minecraft isnt coded in 1.8, so you cant use lambda expressions.

But lambdas a fully working at the development eclipse environment. This error happens only at build time

[RedEnergy]

In log gradle says "(use -source 8 or higher to enable lambda expressions)" doesn't "-source 8" an argument? Where can i specify it?

[RedEnergy]

'1.8' is something else than 1.8. The first one is a String, the 2nd one isn't.

i removed brackets but it didn't help