# Error compiling SDK Example Perspective component with Gradle **URL:** \ **Category:** Module Development\ **Created:** [May 4, 2021, 10:35am UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304 "2021-05-04T10:35:54Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![leo2a2b](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/leo2a2b/32/26458_2.png) [@leo2a2b](https://forum.inductiveautomation.com/u/leo2a2b)\ **Post date:** [May 4, 2021, 10:35am UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/1 "2021-05-04T10:35:54Z")
Hi, I downloaded the SDK Exemple and try to build the perspective component with Gradle but an error appeard: ’ java.lang.UnsupportedClassVersionError: com/inductiveautomation/gradle/IgnitionModlPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes c lass file versions up to 52.0 '. I tried to downgrade JDK version or update gradle version but nothing change. I have compiled on Windows 10 with Intelij IDE. Is there a solution ? Thank’s ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 4, 2021, 12:40pm UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/2 "2021-05-04T12:40:43Z")
Sounds like you’re trying to build with JDK 8 instead of JDK 11. ---
**Author:** ![leo2a2b](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/leo2a2b/32/26458_2.png) [@leo2a2b](https://forum.inductiveautomation.com/u/leo2a2b)\ **Post date:** [May 4, 2021, 1:11pm UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/3 "2021-05-04T13:11:37Z")
I tried with JDK 11 but then this error is showing: 'Could not initialize class org.codehaus.groovy.runtime.InvokerHelper'. Update: after relaunch IDE i have now : 'Execution failed for task ':web:nodeSetup'. > Could not resolve all files for configuration ':web:detachedConfiguration1'. > Could not find org.nodejs:node:8.15.0. > Searched in the following locations: > - [https://nodejs.org/dist/v8.15.0/ivy.xml](https://nodejs.org/dist/v8.15.0/ivy.xml) > Required by: > project :web Possible solution: - Declare repository providing the artifact, see the documentation at [Declaring repositories](https://docs.gradle.org/current/userguide/declaring_repositories.html)' ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 4, 2021, 1:56pm UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/4 "2021-05-04T13:56:04Z")
Does it compile and build via the command line? ```auto ./gradlew build ``` ---
**Author:** ![leo2a2b](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/leo2a2b/32/26458_2.png) [@leo2a2b](https://forum.inductiveautomation.com/u/leo2a2b)\ **Post date:** [May 5, 2021, 7:34am UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/5 "2021-05-05T07:34:14Z")
I tried to build via `gradlew build` and `gradlew buildModule`, by the way the command line `gradlew clean` doesn't work either. The error > Could not initialize class org.codehaus.groovy.runtime.InvokerHelper is showing at the importation of the project on Intelij and appears when it Sync. However, i have succesfully build it on a Windows server 2016 system (it's working perfectly), while i tried on an other Windows 10 system and it's not even building. Is this related to a particular JAVA\_HOME path or configuration on Windows server? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 5, 2021, 1:53pm UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/6 "2021-05-05T13:53:12Z")
I don’t think you have JDK 11 set as your JDK. Check the output of `java -version` and the value of `$JAVA_HOME`. ---
**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\ **Post date:** [July 9, 2021, 8:51am UTC](https://forum.inductiveautomation.com/t/error-compiling-sdk-example-perspective-component-with-gradle/46304/7 "2021-07-09T08:51:42Z")
i just seemed to have had this problem too, Adjusting the javahome and path didnt seem to work for me manually, But i used the scripting version on this site to easily change between java version and that worked > **[How to switch Java versions in Windows (updated for JDK 16)](https://www.happycoders.eu/java/how-to-switch-multiple-java-versions-windows/)** > > How to install multiple Java versions on Windows simultaneously? – How to switch Java versions on the command line? (Up to JDK 16) (had to adjust the script to be the right version (11.0.11)) and when i go to jdk version 11 it seems to works fine. Tho it seems that somehow whenever i close my commandpromt the javaversion changes back, but with this script that is easily handled ```auto error: Could not initialize class org.codehaus.groovy.runtime.InvokerHelper java -version openjdk version "14.0.2" 2020-07-14 OpenJDK Runtime Environment (build 14.0.2+12-46) OpenJDK 64-Bit Server VM (build 14.0.2+12-46, mixed mode, sharing) java11 ((=the adjusted script from the link)) Java 11 activated. java -version java version "11.0.11" 2021-04-20 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.11+9-LTS-194) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.11+9-LTS-194, mixed mode) gradlew buildModule Starting a Gradle Daemon, 2 incompatible Daemons could not be reused, use --status for details ... BUILD SUCCESSFUL in 9m 16s 27 actionable tasks: 27 executed C:\perspective-component> ```