Add version to Hibernate mapping so we get optimistic locking this solves
number of parallel calls trying to update/guess and mess with the lesson
counter
* Remove Guava dependency from WebGoat
* Add Checkstyle to the project with very basic standards so we have a
style across lessons. It does not interfere with basic Intellij formatting
Avoid these compilation errors:
```
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjectionExecute.java:[47,8] class HttpBasicsInterceptRequest is public, should be declared in a file named HttpBasicsInterceptRequest.java
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[38,8] class HttpProxies is public, should be declared in a file named HttpProxies.java
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[5,33] cannot find symbol
symbol: class AbstractLesson
location: package org.owasp.webgoat.lessons
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[38,34] cannot find symbol
symbol: class AbstractLesson
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[39,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[44,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[49,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[54,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[59,5] method does not override or implement a method from a supertype
[INFO] 9 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.356 s
[INFO] Finished at: 2019-10-19T21:13:03Z
[INFO] ------------------------------------------------------------------------
```
WebGoat 8 latest ([develop](9fdbbf69d6)) has the following compilation error:
```
Building Maven project at /builds/gitlab-org/security-products/tests/webgoat/webgoat-lessons/webgoat-lesson-template.
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for org.owasp.webgoat.lesson:webgoat-lesson-template:[unknown-version]: Could not find artifact org.owasp.webgoat.lesson:webgoat-lessons-parent:pom:8.0-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 6, column 13
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.owasp.webgoat.lesson:webgoat-lesson-template:[unknown-version] (/builds/gitlab-org/security-products/tests/webgoat/webgoat-lessons/webgoat-lesson-template/pom.xml) has 1 error
[ERROR] Non-resolvable parent POM for org.owasp.webgoat.lesson:webgoat-lesson-template:[unknown-version]: Could not find artifact org.owasp.webgoat.lesson:webgoat-lessons-parent:pom:8.0-SNAPSHOT and 'parent.relativePath' points at wrong local POM @ line 6, column 13 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
Error: Project couldn't be built: exit status 1
```
This is due to an invalid (obsolete) ref in the parent artifact.
Full logs: https://gitlab.com/gitlab-org/security-products/tests/webgoat/-/jobs/322887707
* xxe path info aid added
* xxe path info aid added
* changes to template file and hints
* added ssl test support for XXE
* added ssl test support for XXE
* restconfig replaced by httpsrelaxed
* processed review comments on hints and example
* first objects and unit tests for making a fix for the lesson
* example added
* unit test for windows and linux
* added unit tests hints and feedbacks and updated lesson pages
* small typo correction
* XSS lesson completion fixes
* removed log all
* lesson progress capable of deprecated assignments in the database
* fixed unit test for lesson progress
