[FIXED] Gradle error: Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

Issue

I need to see my dependencies in Gradle to fix a problem with multiple SLF4J bindings.
However, when I run 'gradle dependencies' I get the error:

Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

In a similar question in stack-overflow Android Studio Could not initialize class org.codehaus.groovy.runtime.InvokerHelper
it was recommended to

1. install java jdk-14
2. upgrade to gradle version 6.3

I changed the jdk to 14 in IntelliJ in 2 places:

1. File -> Project Structure -> Project -> Project SDK
2. Preferences -> Gradle -> Gradle JVM

I attempted to update gradle from the command line with: 'gradle wrapper --gradle-version 6.3' and got the same error:

Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

I then changed the field 'distributionUrl' in the file 'gradle-wrapper.properties' to 'gradle-6.3', as instructed here https://github.com/gradle/gradle/issues/10248.

I tried various combinations of jdk and gradle versions but nothing seems to work.

Solution

So from your repo, if you have gradle-wrapper.properties like this:

➜ cat gradle/wrapper/gradle-wrapper.properties
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

On first compilation, Gradle tells you that:

  build file '/Users/tim/Code/Java/brobotREST/build.gradle': 36:
     all buildscript {} blocks must appear before any plugins {} blocks in the script

So if you move the buildscript section up to the top of the build.gradle file, it all seems to work

And I get:

➜ ./gradlew -version

------------------------------------------------------------
Gradle 6.3
------------------------------------------------------------

Build time:   2020-03-24 19:52:07 UTC
Revision:     bacd40b727b0130eeac8855ae3f9fd9a0b207c60

Kotlin:       1.3.70
Groovy:       2.5.10
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          14 (Azul Systems, Inc. 14+36)
OS:           Mac OS X 10.15.4 x86_64

Answered By - tim_yates
Answer Checked By - Mary Flores (JavaFixing Volunteer)