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Tuesday, June 11, 2013

Skip cobertura coverage check when skip unit test

After I introduced embedded mysql for unit testing to my project, the build is taking longer now.  For my local development, sometimes I want to disable the unit test:

      mvn clean package -DskipTests

Note that you can even skip the compiling of test class by using

     mvn clean package -Dmaven.test.skip

However, if you use cobertura for code coverage check, you would get the following error:

[ERROR] Project failed check. Total branch coverage rate of 0.0% is below 85.0%
Project failed check. Total line coverage rate of 0.0% is below 85.0%

So you need to skip cobertura as well.  if you google "skip cobertura", most answers suggested using haltOnFailure. However, cobertura already provides the skip functionality:

     mvn clean package -DskipTests -Dcobertura.skip

With -Dcobertura.skip, cobertura check will be skipped:

[INFO] --- cobertura-maven-plugin:2.5.2:instrument (default) @ tag-service ---
[INFO] Skipping cobertura execution

Monday, June 10, 2013

Using embedded mysql database for unit test with maven and spring

I used H2 in memory database to unit test my DAO.  However, my production database is MySQL.
Generally, H2 is compatible with MySQL.  However, H2 doesn't support ENUM type yet, and my schema uses ENUM for a column definition.  Inspired by this post and another, I successfully used embedded MySQL for unit test.  Here is what I did:

1.  Add mysql-connector-mxj dependency:

2. Create and

3. Create spring bean datasource:
4. Run unit test with Spring:
A couple things are worth mentioning:

1. The test uses Spring annotation @DirtiesContext(classMode = ClassMode.AFTER_EACH_TEST_METHOD) which reload the context after every test method.  It means every test method starts a new mysql instance.  You may group test methods to 2 different categories, one changes data, and another not.  For those methods don't change data, only need to create one instance of mysql to speed up testing.

2. If you see the following error message on Linux server:
/lib64/ version `GLIBC_2.7' not found (required by /tmp/test_db_2420035739165052/bin/mysqld)

You need to either downgrade mysql-connector-mxj to 5.0.11 or upgrade your linux OS.  I got the above error message on CentOS 5.4 with 5.0.12, but no problem with 5.0.11. However, 5.0.11 isn't in any public maven repo, but you can download it from here and install it to your local repo, or upload to your company's repo. Using the following command to check CentOS version:

cat /etc/redhat-release

3. The code is tested on Mac and CentOS only, and can be downloaded from github

Monday, June 3, 2013

Example for enabling CORS support in Spring Rest Api 3.2

My last year's post "Enable CORS support in REST services with Spring 3.1" seems causing some confusion.  I decided to create an example to show how to enable CORS with Spring rest api.  The CorsFilter is same as before:

Below are 2 endpoints from

The update method adds the header Access-Control-Allow-Origin with "*", but delete method doesn't.  Therefore, the update method is enabled with CORS, but delete isn't.  If delete endpoint is called, the following error will be shown in Chrome:

"cannot load http://localhost:8080/rest/employee/1. Origin is not allowed by Access-Control-Allow-Origin."

However, the delete method is still invoked on the server side since the pre-flight request (OPTIONS)
allows DELETE method to be called.

The entire project can be downloaded from github.  Following README to test it.

My intention was to disable/enable CORS support in each individual method by setting "Access-Control-Allow-Origin", but it seems not working as expected:  Although the browser returns correct info, the method call is still invoked on the server side even Access-Control-Allow-Origin is not set.  If you are allowed to enable all endpoints with CORS support, the code can be simplified as below:

The only difference is that addHeader("Access-Control-Allow-Origin") is moved out the if check. And then the update method can be simplified as:

The code can be downloaded from github too.