Upgrade version of groovy
Hi, I don't know if it qualifies as a soapui bug or not but bundled 1.8.0 version of groovy (soapui 4.5.1) has the following problem: JsonSlurper does not handle backslashes at the end of a String...
Forum Discussion
I already filed this with SmartBear. They said _all_ the libraries are outdated, and it will take a very long time to upgrade them. 
In the meantime you can copy $GROOVY_HOME/embeddable/groovy-all-2.*.jar to $SOAPUI_HOME/lib, and remove $SOAPUI_HOME/lib/groovy-all-1.8.0.jar. I am running with Groovy 2.1.1 so far with no problems.
In the meantime you can copy $GROOVY_HOME/embeddable/groovy-all-2.*.jar to $SOAPUI_HOME/lib, and remove $SOAPUI_HOME/lib/groovy-all-1.8.0.jar. I am running with Groovy 2.1.1 so far with no problems.