Can't get examples working

[pescadorbob]

As I've been running through gradle in action examples using this code, they don't work. I've been using the gradle wrapper, but it complains about:
A problem occurred evaluating script.

java/util/HashMap$Entry

If I try to upgrade to 2.1, then I get this error:
D:\work\todo>gradle wrapper --gradle-version 2.1
:buildSrc:clean
:buildSrc:compileJava UP-TO-DATE
:buildSrc:compileGroovy
:buildSrc:processResources UP-TO-DATE
:buildSrc:classes
:buildSrc:jar
:buildSrc:assemble
:buildSrc:compileTestJava UP-TO-DATE
:buildSrc:compileTestGroovy UP-TO-DATE
:buildSrc:processTestResources UP-TO-DATE
:buildSrc:testClasses UP-TO-DATE
:buildSrc:test UP-TO-DATE
:buildSrc:check UP-TO-DATE
:buildSrc:build
Loading configuration for environment 'test'.

FAILURE: Build failed with an exception.

• Where:
  Script 'D:\work\todo\gradle\jacoco.gradle' line: 11

• What went wrong:
  A problem occurred evaluating script.

  Failed to apply plugin [class 'org.ajoberstar.gradle.jacoco.plugins.JacocoPlugin']
  java.lang.String cannot be cast to org.gradle.api.artifacts.Configuration

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 5.662 secs

D:\work\todo>

Is there any kind of way to migrate forward so I can make it through the examples in your book?

[bmuschko]

As I've been running through gradle in action examples using this code, they don't work.

I am automatically executing most of the code example with the checked in Wrapper version via CI. Which code example does not work for you with the checked in Wrapper?

D:\work\todo>gradle wrapper --gradle-version 2.1

In this case you are not using the Wrapper. You are using the Gradle distribution installed on your machine. Keep in mind that the command line option --gradle-version was introduced with a 2.x version of Gradle so the checked in Wrapper (based on 1.7) wouldn't know anything about it. Instead of using the wrapper task, you can manually update the version in gradle/wrapper/gradle-wrapper.properties.

It's unlikely that all of the code example will be compatible with a Gradle 2.x version simply because the Gradle API has breaking changes between major versions.

Script 'D:\work\todo\gradle\jacoco.gradle' line: 11

This leads me to believe that you are executing the command against a different repository. Correct?

[pescadorbob]

Hi, thanks for the quick response. I am running the example using the wrapper from jenkins, but I get the error:
A problem occurred evaluating script.
java/util/HashMap$Entry

as in Figure 13.11 from your book. Perhaps it has something to do with the JDK, or something.

because the wrapper didn't work, I decided to try it out from an updated gradle version. Bad idea, I guess.

I am running it from a forked repository, correct.

Maybe I should use a different JDK and then the examples would work? Is there a way to migrate forward, beside trial and error hell? I didn't see in the readme the exact JDK that is needed. I would have hoped it would be backwards compatible. But, I'll try out jdk 1.7 and 1.6 to see if the examples work better.

Thanks.

[pescadorbob]

JDK 1.7 resolved it.

[bmuschko]

Hi, thanks for the quick response. I am running the example using the wrapper from jenkins, but I get the error:
A problem occurred evaluating script.
java/util/HashMap$Entry

This is mentioned in the documentation: If you are using JDK8, you will want to build the code with a Gradle version >= 2.0.. I guess that's the reason you are upgrading.

I am running it from a forked repository, correct.

The repository you are running here is more an add-on to the actual code of the book. I'd recommend opening an issue in the corresponding repository. It confused me first what code you were referring to.

Maybe I should use a different JDK and then the examples would work? Is there a way to migrate forward, beside trial and error hell? I didn't see in the readme the exact JDK that is needed. I would have hoped it would be backwards compatible. But, I'll try out jdk 1.7 and 1.6 to see if the examples work better.

It generally should be forward-compatible. I know that the Jacoco plugin won't work though. At the point of writing the book, this plugin wasn't part of Gradle core yet. When I get time again, I will touch up the code example.