KeyFactory.kind() requires a cast... didn't expect that at all...

[jgeewax]

Code I had was:

KeyFactory keyFactory = datastore.newKeyFactory().kind("Person");

Error I was getting was:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project hello-datastore: Compilation failure
[ERROR] /usr/local/google/home/jjg/gcdjavasample/hello-datastore/src/main/java/org/geewax/hellodatastore/HelloDatastore.java:[19,58] error: incompatible types
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project hello-datastore: Compilation failure
/usr/local/google/home/jjg/gcdjavasample/hello-datastore/src/main/java/org/geewax/hellodatastore/HelloDatastore.java:[19,58] error: incompatible types


        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
/usr/local/google/home/jjg/gcdjavasample/hello-datastore/src/main/java/org/geewax/hellodatastore/HelloDatastore.java:[19,58] error: incompatible types


        at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:516)
        at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
[ERROR] 
[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/MojoFailureException

Changing this to

KeyFactory keyFactory = (KeyFactory) datastore.newKeyFactory().kind("Person");

fixed the problem

However the docs at http://googlecloudplatform.github.io/gcloud-java/apidocs/com/google/gcloud/datastore/package-summary.html say I shouldn't need to do this :(

[aozarov]

How is that different from DatastoreServiceTest#testKeyFactory. it does the same and does not require a cast. did mvn compile on the github clone work fine for you?

[jgeewax]

mvn compile (AND mvn test) on the GH cloned repository work just fine... but the project I created using the "Maven in 5 minutes" guide depending on version 0.0.3 fails.

Here is my pom.xml file:

<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">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.geewax.hellodatastore</groupId>
  <artifactId>hello-datastore</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>
  <name>hello-datastore</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.google.gcloud</groupId>
      <artifactId>gcloud-java</artifactId>
      <version>0.0.3</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.3.2</version>
      </plugin>
    </plugins>
  </build>
</project>

Any ideas? It was a completely fresh project...

[aozarov]

I assume this issue is a dup of issue #36?

[jgeewax]

Yes I believe it is.