Gradle init from Maven - problems

I’m trying to use gradle init on Maven projects to learn about Gradle and see how well the converison works. I am currently seeing two issues: 1) There is a warning during compile about boot classpath, in association with the java compile source version 1.5. Maven doesn’t show this warning - does Maven automatically set this? 2) I have tried gradle init on multiple projects, but so far have not been getting successful test runs. After gradle init, gradle compileJava, gradle test, I usually see errors. One small maven project I found is this one: https://github.com/mttkay/signpost.git Errors look like this:

/home/user/gradle_tests/script_output/signpost_v4/signpost-commonshttp3/src/test/java/oauth/signpost/commonshttp3/CommonsHttpOAuthProviderTest.java:6: error: cannot find symbol
import oauth.signpost.OAuthProviderTest;
                     ^
  symbol:
 class OAuthProviderTest
  location: package oauth.signpost
/home/user/gradle_tests/script_output/signpost_v4/signpost-commonshttp3/src/test/java/oauth/signpost/commonshttp3/CommonsHttpOAuthProviderTest.java:12: error: cannot find symbol
public class CommonsHttpOAuthProviderTest extends OAuthProviderTest {

These errors do not appear in Maven. The cor emodule builds and tests correctly with gradle, this is the commonshttp3 module. The pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <parent>
    <artifactId>oauth-signpost</artifactId>
    <groupId>oauth.signpost</groupId>
    <version>1.2.1.1</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <artifactId>signpost-commonshttp3</artifactId>
  <name>signpost-commonshttp3</name>
    <dependencies>
    <dependency>
      <groupId>oauth.signpost</groupId>
      <artifactId>signpost-core</artifactId>
      <version>1.2.1.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>oauth.signpost</groupId>
      <artifactId>signpost-core</artifactId>
      <version>1.2.1.1</version>
      <type>test-jar</type>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>commons-httpclient</groupId>
      <artifactId>commons-httpclient</artifactId>
      <version>3.1</version>
    </dependency>
  </dependencies>
  </project>

The build.gradle in this module:

description = 'signpost-commonshttp3'
dependencies {
  compile project(':signpost-core')
    compile group: 'commons-httpclient', name: 'commons-httpclient', version:'3.1'
  testCompile project(':signpost-core')
}
  task packageTests(type: Jar) {
  from sourceSets.test.output
  classifier = 'tests'
}
artifacts.archives packageTests

I should add versions. Maven and gradle use the same Java version. Maven:

Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.7.0_65, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-24-generic", arch: "amd64", family: "unix"

Gradle:

------------------------------------------------------------
Gradle 2.1
------------------------------------------------------------
  Build time:
 2014-09-08 10:40:39 UTC
Build number: none
Revision:
   e6cf70745ac11fa943e19294d19a2c527a669a53
  Groovy:
     2.3.6
Ant:
        Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:
        1.7.0_65 (Oracle Corporation 24.65-b04)
OS:
         Linux 3.13.0-24-generic amd64