Update java "build an app" tutorial

[jseldess]

This PR updates the java "build an app" tutorial to cover both the jdbc driver and the Hibernate ORM.

@jordanlewis, @cuongdo, not sure if the "Run the Java code" step is as clear as it should be. Please don't hold back.

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This change is 

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/5cbdd0d9f99c336e8c622c5d38bbe9b2e8319ce7/

[cuongdo]

Also, in the language/driver/ORM matrix, it still says "Hibernate support coming soon"

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Review status: 0 of 1 files reviewed at latest revision, 4 unresolved discussions.

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build-a-java-app-with-cockroachdb.md, line 43 at r1 (raw file):

~~~ shell
$ brew install gradle

This is macOS-specific. On Ubuntu Linux, it'd be apt-get install gradle

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build-a-java-app-with-cockroachdb.md, line 105 at r1 (raw file):

`build.gradle` | This is the file you will run to execute your app. 

For more insight into this sample application, review the `Sample.java` file, which uses the [Hibernate ORM](http://hibernate.org/orm/) to map Java-specific objects to SQL operations. Specifically, `public Account() {}` creates an `accounts` table based on the Account class, `session.save(new Account())` inserts rows into the table, and `session.getCriteriaBuilder().createQuery(Account.class)` selects from the table so that balances can be printed. 

The part about public Account(){} isn't right. @jordanlewis can help with wording this

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build-a-java-app-with-cockroachdb.md, line 108 at r1 (raw file):

~~~ java
{% include app/hibernate-basic-sample/Sample.java %}

This code block should have some heading to identify it, like the filename (Sample.java)

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build-a-java-app-with-cockroachdb.md, line 117 at r1 (raw file):

~~~

Toward the end of the output, you shoud see:

s/shoud/should/

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Comments from Reviewable

[jordanlewis]

Review status: 0 of 1 files reviewed at latest revision, 4 unresolved discussions.

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build-a-java-app-with-cockroachdb.md, line 105 at r1 (raw file):

Previously, cuongdo (Cuong Do) wrote…

The part about public Account(){} isn't right. @jordanlewis can help with wording this

Cuong is correct, this isn't quite right. You can say something like "The Account class defines a model representing an account.". The part that instructs Hibernate to turn the model into a table is actually in the top of the file, where it says .addAnnotatedClass(Account.class), but I wouldn't really write a sentence explaining where the accounts table is created - that's all done behind the scenes. We can talk offline if you need more clarity here.

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Comments from Reviewable

[jseldess]

Updated that matrix, @cuongdo. Thanks.

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Review status: 0 of 2 files reviewed at latest revision, 5 unresolved discussions.

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build-a-java-app-with-cockroachdb.md, line 43 at r1 (raw file):

Previously, cuongdo (Cuong Do) wrote…

This is macOS-specific. On Ubuntu Linux, it'd be apt-get install gradle

Done.

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build-a-java-app-with-cockroachdb.md, line 105 at r1 (raw file):

Previously, jordanlewis (Jordan Lewis) wrote…

Cuong is correct, this isn't quite right. You can say something like "The Account class defines a model representing an account.". The part that instructs Hibernate to turn the model into a table is actually in the top of the file, where it says .addAnnotatedClass(Account.class), but I wouldn't really write a sentence explaining where the accounts table is created - that's all done behind the scenes. We can talk offline if you need more clarity here.

Reworked with Jordan's help.

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build-a-java-app-with-cockroachdb.md, line 108 at r1 (raw file):

Previously, cuongdo (Cuong Do) wrote…

This code block should have some heading to identify it, like the filename (Sample.java)

I need to research how to do this. Might have to do it after merging.

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build-a-java-app-with-cockroachdb.md, line 117 at r1 (raw file):

Previously, cuongdo (Cuong Do) wrote…

s/shoud/should/

Done.

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Comments from Reviewable

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/1a4950f175fb003eba4b1090794d7e38f06e989d/

[jordanlewis]

!

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Reviewed 2 of 2 files at r2.
Review status: all files reviewed at latest revision, 4 unresolved discussions.

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Comments from Reviewable