MergeChecks script error

[Kha Hoang]

We have the MergeChecks script in BitBucket and it has been working; however, after upgraded ScriptRunner to version 8.1.0, the script is broken and gave error:

# Script: get the merge from branch value and to branch value, split it by / and get the second value after splitted.  compare them and if the values are the same, allow the merge.

# e.g. toBranch = develop/asc  and fromBranch = feature/asc/<Jira-issue>

def toBranch = mergeRequest.pullRequest.toRef.displayId

def fromBranch = mergeRequest.pullRequest.fromRef.displayId

def str1;

def str2;

str1 = toBranch.split('/')[1];

str2 = fromBranch.split('/')[1];

if (str1 == str2) {

    return false;

} else {

    return true;

}

After upgraded ScriptRunner, It gave the following error.  How do we fix it?

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
General error during semantic analysis: Expression [BinaryExpression] is not allowed: toBranch.split(/)[1]

java.lang.SecurityException: Expression [BinaryExpression] is not allowed: toBranch.split(/)[1]
	at org.codehaus.groovy.control.customizers.SecureASTCustomizer$SecuringCodeVisitor.assertExpressionAuthorized(SecureASTCustomizer.java:1084)
	at org.codehaus.groovy.control.customizers.SecureASTCustomizer$SecuringCodeVisitor.visitBinaryExpression(SecureASTCustomizer.java:1300)
	at org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:60)
	at org.codehaus.groovy.control.customizers.SecureASTCustomizer$SecuringCodeVisitor.visitBinaryExpression(SecureASTCustomizer.java:1303)
	at org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:60)
	at org.codehaus.groovy.control.customizers.SecureASTCustomizer$SecuringCodeVisitor.visitExpressionStatement(SecureASTCustomizer.java:1173)
	at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:41)
	at org.codehaus.groovy.control.customizers.SecureASTCustomizer$SecuringCodeVisitor.visitBlockStatement(SecureASTCustomizer.java:1137)
	at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:70)