Exclude specific tasks of a sub-project in Gradle

To exclude specific tasks of a sub-project in Gradle,

do as follows:

gradle build -x :test-common:startScripts -x :test-common:bootRepackage

Run a specific task of a sub-project in Gradle

To run a specific task of a sub-project in Gradle,

do as follows:

gradle :test-common:startScripts

No signature of method: build_59tj2ra5d1mn9tk0vrfinvo79c$_run_closure2.id() is applicable for argument types: (java.lang.String) values: [org.asciidoctor.convert]

You might encounter the following exception:

FAILURE: Build failed with an exception.

* Where:
Build file '/home/izeye/applications/test/build.gradle' line: 9

* What went wrong:
A problem occurred evaluating root project 'test'.
> No signature of method: build_59tj2ra5d1mn9tk0vrfinvo79c$_run_closure2.id() is applicable for argument types: (java.lang.String) values: [org.asciidoctor.convert]
  Possible solutions: is(java.lang.Object), is(java.lang.Object), find(), find(), find(groovy.lang.Closure), find(groovy.lang.Closure)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Gradle version was 1.12.

Just upgrading to 2.5 fixed the problem.

Error: Invalid value for attribute d="MNaN,82.5LNaN,41.25LNaN,0LNaN,123.75LNaN,330"

You might encounter the following error in D3.js:

Error: Invalid value for <path> attribute d="MNaN,82.5LNaN,41.25LNaN,0LNaN,123.75LNaN,330"

If you get the following date and time format:

"collectedTime" : "2015-05-19 14:48:40",

you need to parse it as follows:

        svg.x.domain(d3.extent(data, function (d) {
//            return d.collectedTime;
            var parsedTime = d3.time.format("%Y-%m-%d %H:%M:%S").parse(d.collectedTime);
            return parsedTime;
        }));

        svg.line = d3.svg.line()
                .x(function (d) {
                    //return svg.x(d.timestamp);
                    //return svg.x(d.collectedTime);
                    var parsedTime = d3.time.format("%Y-%m-%d %H:%M:%S").parse(d.collectedTime);
                    return svg.x(parsedTime);
                })
                .y(function (d) {
                    return svg.y(valueFunction(d));
                });

References:
http://stackoverflow.com/questions/26070783/invalid-value-for-path-attribute
https://github.com/mbostock/d3/wiki/Time-Formatting

Get the latest commid ID in Get

To get the latest commid ID in Get,

use the following command:

$ git log --format="%H" -n 1

Reference:
http://stackoverflow.com/questions/19176359/how-to-get-the-last-commit-id-of-a-remote-repo-using-curl-like-command

Git rebase and squash commits

* Check commit logs as follows:

$ git log

commit da274bb605a962fa02ae8fba2da27b934b59d68d
Author: izeye <izeye@naver.com>
Date:   Tue Jul 28 11:55:38 2015 +0900

    Fix typos.

commit 0e5f855954a69dd05128442bf9c996efc8d35f0d
Author: izeye <izeye@naver.com>
Date:   Tue Jul 28 11:47:52 2015 +0900

    Fix typos.

commit 32128a6ac2390250d9e0b933618177846fb7bef0
Author: Stephane Nicoll <snicoll@pivotal.io>
Date:   Mon Jul 27 16:02:03 2015 +0200

    Polish
...

* `git rebase` with the base commit as follows:

$ git rebase -i 32128a6ac2390250d9e0b933618177846fb7bef0

pick 0e5f855 Fix typos.
squash da274bb Fix typos.

* Type `:wq` and change commit messages as follows:

# This is a combination of 2 commits.
# The first commit's message is:

Fix typos.

# This is the 2nd commit message:

#Fix typos.

* Type `:wq` again.

* Check commit logs again as follows:

$ git log

commit d51d6b7e8d21c60a6ac9e6e6e60847c112514998
Author: izeye <izeye@naver.com>
Date:   Tue Jul 28 11:47:52 2015 +0900

    Fix typos.

commit 32128a6ac2390250d9e0b933618177846fb7bef0
Author: Stephane Nicoll <snicoll@pivotal.io>
Date:   Mon Jul 27 16:02:03 2015 +0200

    Polish

If you want to push it to the remote repository,

do as follows:

$ git push -f

Reference:
https://github.com/edx/edx-platform/wiki/How-to-Rebase-a-Pull-Request

only buildscript {} and other plugins {} script blocks are allowed before plugins {} blocks, no other statements are allowed

You might encounter the following error:

only buildscript {} and other plugins {} script blocks are allowed before plugins {} blocks, no other statements are allowed

Just do the instruction in the error message.

In order words, move `plugin {}` script block on top of the script

except `buildscript {}` and other `plugins {}` script blocks.

Change Gradle version in IntelliJ

To change Gradle version in IntelliJ,

do as follows:

File -> Settings -> Gradle -> Gradle home

Format `yyyy-MM-dd HH:mm:ss` in Bash

To format `yyyy-MM-dd HH:mm:ss` in Bash,

do as follows:

date +"%F %T"

Uncaught RangeError: Maximum call stack size exceeded

I got the following error suddenly in Windows Chrome Canary:

Uncaught RangeError: Maximum call stack size exceeded

It didn't happen in Windows Chrome, Mac Chrome, and Mac Chrome Canary.

I guess it's a bug of Windows Chrome Canary.

I'm wondering why this kind of bug is happening.

I guess they have tons of tests.

Although it's quite easily reproducible, why did they miss it?

java.lang.NoClassDefFoundError: org/codehaus/groovy/runtime/typehandling/ShortTypeHandling

When I used the following command:

gradle build

I got the following exception:

FAILURE: Build failed with an exception.
             
* Where:    
Build file 'C:\Users\nbp\IdeaProjects\impression-neo\build.gradle' line: 101
             
* What went wrong:
Execution failed for task ':generateGitProperties'.
> java.lang.NoClassDefFoundError: org/codehaus/groovy/runtime/typehandling/ShortTypeHandling
             
* Try:      
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
             
BUILD FAILED

When I checked the Gradle version with the following command:

gradle -v

the result was as follows:

------------------------------------------------------------
Gradle 1.11
------------------------------------------------------------

Build time:   2014-02-11 11:34:39 UTC
Build number: none
Revision:     a831fa866d46cbee94e61a09af15f9dd95987421

Groovy:       1.8.6
Ant:          Apache Ant(TM) version 1.9.2 compiled on July 8 2013
Ivy:          2.2.0
JVM:          1.8.0_05 (Oracle Corporation 25.5-b02)
OS:           Windows 7 6.1 amd64

When I upgraded Gradle to 2.5 as follows:

------------------------------------------------------------
Gradle 2.5
------------------------------------------------------------

Build time:   2015-07-08 07:38:37 UTC
Build number: none
Revision:     093765bccd3ee722ed5310583e5ed140688a8c2b

Groovy:       2.3.10
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.8.0_05 (Oracle Corporation 25.5-b02)
OS:           Windows 7 6.1 amd64

the problem was solved.

I guess the problem was caused by the old version of Groovy.

Use Swagger in Spring Boot

To use Swagger in Spring Boot,

add the following dependencies to `build.gradle`:

    compile("io.springfox:springfox-swagger2:2.1.1")
    compile("io.springfox:springfox-swagger-ui:2.1.1")

and add `@EnableSwagger2` as follows:

@SpringBootApplication
@EnableSwagger2
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}

}

Open the following URL in your browser:

http://localhost:8080/swagger-ui.html

Reference:
http://springfox.github.io/springfox/docs/current/

Spring Data JPA `IN` clause with Spring Data REST

You can do as follows:

http://localhost:8080/api/events/search/findByLevelIn?level=ERROR,WARN

See the following link for the details on Spring Data JPA `IN` clause:

http://izeye.blogspot.kr/2015/07/use-in-caluse-with-spring-data-jpa.html

Use `IN` clause with Spring Data JPA

To use `IN` clause with Spring Data JPA,

you can do as follows:

public interface EventRepository extends JpaRepository<Event, Long> {

  Page<Event> findByLevelIn(@Param("level") Set<EventLevel> levels, Pageable pageable);

}

You can test as follows:

  @Test
  public void testFindByLevelIn() {
    Set<EventLevel> levels = new HashSet<>();
    levels.add(EventLevel.ERROR);
    levels.add(EventLevel.WARN);
    levels.add(EventLevel.INFO);

    Page<Event> events = eventRepository.findByLevelIn(levels, new PageRequest(0, 100));
    events.forEach(System.out::println);
  }

Reference:
http://stackoverflow.com/questions/18987292/spring-crudrepository-findbyinventoryidslistlong-inventoryidlist-equivalen

sun.net.util.IPAddressUtil vs. org.apache.commons.validator.routines.InetAddressValidator

There are two IP address validation utils:

sun.net.util.IPAddressUtil
org.apache.commons.validator.routines.InetAddressValidator

I made some tests for both.

`IPAddressUtil` tests:

// NOTE:
// Got the following warning in Travis:
// warning: IPAddressUtil is internal proprietary API and may be removed in a future release
public class IPAddressUtilTests {

@Rule
public ExpectedException thrown = ExpectedException.none();

@Test
public void testIsIPv4LiteralAddress() {
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1.2.3.0"));
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1.2.3.4"));
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1.2.3.255"));
assertFalse(IPAddressUtil.isIPv4LiteralAddress("1.2.3.256"));
assertFalse(IPAddressUtil.isIPv4LiteralAddress("1.2.3."));

// NOTE: They look weird but valid.
// See http://stackoverflow.com/questions/7550806/check-valid-ipv4-address-in-java
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1.2.3"));
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1.2"));
assertTrue(IPAddressUtil.isIPv4LiteralAddress("1"));

assertFalse(IPAddressUtil.isIPv4LiteralAddress(""));
assertFalse(IPAddressUtil.isIPv4LiteralAddress("::1"));

thrown.expect(NullPointerException.class);
IPAddressUtil.isIPv4LiteralAddress(null);
}

@Test
public void testIsIPv6LiteralAddress() {
assertTrue(IPAddressUtil.isIPv6LiteralAddress("::1"));
assertFalse(IPAddressUtil.isIPv6LiteralAddress("1.2.3.4"));
}

}

`InetAddressValidator` tests:

public class InetAddressValidatorTests {

InetAddressValidator validator = InetAddressValidator.getInstance();

@Test
public void testIsValidInet4Address() {
assertTrue(validator.isValidInet4Address("1.2.3.0"));
assertTrue(validator.isValidInet4Address("1.2.3.4"));
assertTrue(validator.isValidInet4Address("1.2.3.255"));
assertFalse(validator.isValidInet4Address("1.2.3.256"));
assertFalse(validator.isValidInet4Address("1.2.3."));
assertFalse(validator.isValidInet4Address("1.2.3"));
assertFalse(validator.isValidInet4Address("1.2"));
assertFalse(validator.isValidInet4Address("1"));
assertFalse(validator.isValidInet4Address(""));
assertFalse(validator.isValidInet4Address("::1"));
assertFalse(validator.isValidInet4Address(null));
}

@Test
public void testIsValidInet6Address() {
assertTrue(validator.isValidInet6Address("::1"));
assertFalse(validator.isValidInet6Address("1.2.3.4"));
}

}

As you can see the above tests,

they work differently.

Don't use `IPAddressUtil`.

I got the following warning from Travis builds when I used it:

warning: IPAddressUtil is internal proprietary API and may be removed in a future release

Reference AngularJS's `$scope` in Chrome's Console

To reference AngularJS's `$scope.events` in Chrome's Console,

select the target element in `Elements` tab and use the following in `Console` tab:

angular.element($0).scope().events

Reference:
http://stackoverflow.com/questions/13743058/how-to-access-the-angular-scope-variable-in-browsers-console

Run a specifc test in Gradle

To run a specific test in Gradle,

you can use the following command:

gradle test --tests *SomeTests.test

Reference:
http://stackoverflow.com/questions/22505533/how-to-run-a-one-test-class-only-on-gradle

Spring Data REST max page size 1000

When I tried to fetch 2000 entries in Spring Data REST,

I got only 1000 entries.

I didn't know the reason until I saw the following source:

https://github.com/spring-projects/spring-data-rest/blob/master/spring-data-rest-core/src/main/java/org/springframework/data/rest/core/config/RepositoryRestConfiguration.java

It is used in `HateoasPageableHandlerMethodArgumentResolver.enhance()` as follows:

builder.replaceQueryParam(sizePropertyName, pageable.getPageSize() <= getMaxPageSize() ? pageable.getPageSize()
: getMaxPageSize());

If you use Spring Boot and want to change the default value,

you can add the following property to `application.properties`:

spring.data.rest.max-page-size=10000

I didn't find any related documentation except the source.

In my case, it would be nice to have a warning when exceeding the max page size,

but in some cases, it could be irritating, I guess.

Apply `WebJarsResourceResolver` in Spring Boot

To apply `WebJarsResourceResolver` in Spring Boot,

add the following property to `application.properties`:

spring.resources.chain.enabled:true

and add the following dependency to `build.gradle`:

    compile("org.webjars:webjars-locator:0.26")
    compile("org.webjars:jquery:2.1.4")

Now you can use jQuery as follows in Thymeleaf templates:

    <script src="/webjars/jquery/jquery.min.js"></script>

How to exclude a file when publishing an artifact to Maven repository in Gradle

To exclude a `logback.xml` file when publishing an artifact to Maven repository in Gradle,

you can use the following configuration:

ext {
    artifactId = project.name
    artifactVersion = project.version
}

jar {
    baseName = artifactId
    version = artifactVersion
}

task commonJar(type: Jar) {
    baseName "test-common"
    from sourceSets.main.output
    exclude 'logback.xml'
}

publishing {
    repositories {
        maven {
            credentials {
                username "admin"
                password "1234"
            }
            url "http://repo.test.com:8080/repository/internal"
        }
    }

    publications {
        maven(MavenPublication) {
            groupId 'com.test'
            artifactId artifactId
            version artifactVersion

            artifact commonJar
        }
    }
}

Reference:
https://docs.gradle.org/current/userguide/publishing_maven.html

Check an environment variable having Spring profiles if a specific Spring profile is activated by a Bash script

When an environment variable having Spring profiles is as follows:

SPRING_PROFILE=test,something-else

you can check if `test` Spring profile is activated by using the following Bash script:

spring_active_profiles=(${SPRING_PROFILE//,/ })

spring_profile_test_activated=false
for spring_active_profile in ${spring_active_profiles[@]}
do
  if [ $spring_active_profile == "test" ]
  then
    spring_profile_test_activated=true
  fi
done

echo $spring_profile_test_activated
if [ "$spring_profile_test_activated" = true ]
then
  echo "Spring profile 'test' is activated."
fi

Configure Graphite with Dropwizard Metrics in Spring Boot

To configure Graphite with Dropwizard Metrics in Spring Boot,

add the following Java Config:

@Configuration
public class GraphiteConfig {

  @Autowired
  private MetricRegistry metricRegistry;

  @Value("${graphite.host}")
  private String graphiteHost;

  @Value("${graphite.port}")
  private int graphitePort;

  @PostConstruct
  public void initialize() {
    Graphite graphite = new Graphite(this.graphiteHost, this.graphitePort);
    GraphiteReporter reporter = GraphiteReporter.forRegistry(this.metricRegistry)
        .prefixedWith(NetworkUtils.HOSTNAME.replace(".", "_"))
        .convertRatesTo(TimeUnit.SECONDS)
        .convertDurationsTo(TimeUnit.MILLISECONDS)
        .filter(MetricFilter.ALL).build(graphite);
    reporter.start(1, TimeUnit.MINUTES);
  }

}

and add the following properties:

graphite.host=1.2.3.4
graphite.port=2003

Reference:
https://dropwizard.github.io/metrics/3.1.0/manual/graphite/

Install Graphite with Python 2.6.6 on CentOS 6.6

If you don't have pip, install it as follows:

sudo yum install python-pip

# Install Django
sudo pip install 'https://www.djangoproject.com/download/1.4.20/tarball/'

# Install django-tagging
sudo easy_install django-tagging==0.3.1

# Install Twisted
sudo pip install twisted

# Install pytz
sudo pip install pytz

# Install bitmap-fonts-compat
sudo yum install bitmap-fonts-compat

# Install Apache
sudo yum install httpd

# Install mod_wsgi
sudo yum install mod_wsgi

sudo vi /etc/httpd/conf.d/wsgi.conf

#LoadModule wsgi_module modules/mod_wsgi.so

# Install Graphite
sudo pip install https://github.com/graphite-project/ceres/tarball/master
sudo pip install whisper
sudo pip install carbon
sudo pip install graphite-web

# Configure Carbon
cd /opt/graphite/conf
sudo cp carbon.conf.example carbon.conf
sudo cp storage-schemas.conf.example storage-schemas.conf

# Run Carbon
sudo /opt/graphite/bin/carbon-cache.py start

tail -F /opt/graphite/storage/log/carbon-cache/carbon-cache-a/console.log

# Test Carbon
echo "local.random.diceroll 4 `date +%s`" | nc localhost 2003

tail -F /opt/graphite/storage/log/carbon-cache/carbon-cache-a/creates.log

05/07/2015 14:22:22 :: new metric local.random.diceroll matched schema default_1min_for_1day
05/07/2015 14:22:22 :: new metric local.random.diceroll matched aggregation schema default
05/07/2015 14:22:22 :: creating database file /opt/graphite/storage/whisper/local/random/diceroll.wsp (archive=[(60, 1440)] xff=None agg=None)

# Configure Graphite Webapp
sudo cp /opt/graphite/examples/example-graphite-vhost.conf /etc/httpd/conf.d/graphite.conf
sudo cp /opt/graphite/conf/graphite.wsgi.example /opt/graphite/conf/graphite.wsgi
sudo cp /opt/graphite/webapp/graphite/local_settings.py.example /opt/graphite/webapp/graphite/local_settings.py

sudo chown apache:apache /opt/graphite/storage/
sudo chown apache:apache /opt/graphite/storage/log/webapp/

sudo python /opt/graphite/webapp/graphite/manage.py syncdb

# Start Apache
sudo /sbin/service httpd start

tail -F /opt/graphite/storage/log/webapp/error.log

# Visit Graphite Webapp Using Web Browser
http://your-ip-address/

References:
http://graphite.readthedocs.org/en/latest/install.html
http://graphite.readthedocs.org/en/latest/install-pip.html
http://graphite.readthedocs.org/en/latest/config-carbon.html
http://graphite.readthedocs.org/en/latest/admin-carbon.html
https://gist.github.com/ashrithr/9224450

Install a specific version of package by easy_install

To install a specific version of package by easy_install,

you can use the following command:

sudo easy_install django-tagging==0.3.1

Reference:
https://gist.github.com/ashrithr/9224450

Show installed packages by pip

If you want to know whether `tagging` package is installed,

you can use the following command:

$ pip freeze | grep tagging                                                            
django-tagging==0.4
tagging==0.2.1
$

Reference:
https://pip.pypa.io/en/latest/reference/pip_freeze.html

Show the version of an installed package by pip

If you want to know the version of an installed package (say, `django-tagging`) by pip,

use the following command:

$ pip show django-tagging
---
Name: django-tagging
Version: 0.4
Location: /usr/lib/python2.6/site-packages
Requires:
$

Reference:
http://stackoverflow.com/questions/10214827/find-which-version-of-package-is-installed-with-pip

Show installed packages by yum

If you want to know whether `python-devel` package is installed,

you can use the following command:

$ yum list installed | grep python-devel
python-devel.x86_64                2.6.6-52.el6                      @update
$

Reference:
http://www.electrictoolbox.com/yum-list-installed-packages/

Install Django with Python 2.6.6

If you try the following command:

sudo pip install django

you might get some error.

With Python 2.6.6, you can use only 1.4 version of Django.

So you have to use the following command to install:

sudo pip install 'https://www.djangoproject.com/download/1.4.20/tarball/'

You can check if it's working as follows:

$ python
...
>>> import django
>>> print(django.get_version())                                                                                    
1.4.20
>>>

If you want to use greater than 1.4 version,

you should upgrade Python to at least 2.7.

References:
https://docs.djangoproject.com/en/1.8/intro/install/
https://docs.djangoproject.com/en/1.8/faq/install/
https://www.djangoproject.com/download/

[warn] module wsgi_module is already loaded, skipping

When you did the following for Graphite,

sudo cp /opt/graphite/examples/example-graphite-vhost.conf /etc/httpd/conf.d/graphite.conf

you will get the following warning:

httpd ()  : [Fri Jul 03 19:16:29 2015] [warn] module wsgi_module is already loaded, skipping

You should comment out the original WSGI configuration as follows:

sudo vi /etc/httpd/conf.d/wsgi.conf

#LoadModule wsgi_module modules/mod_wsgi.so

Reference:
http://stackoverflow.com/questions/12120057/module-wsgi-module-is-already-loaded-skipping

Apache error log location in CentOS

In CentOS, you can find Apache error log in the following location:

/var/log/httpd/error_log

Reference:
http://lists.centos.org/pipermail/centos/2008-January/049950.html

Install pip in CentOS

To install pip in CentOS, use the following command:

sudo yum install python-pip

Reference:
https://pip.pypa.io/en/latest/installing.html

Read `Map` by `ObjectMapper.readValue()`

If you try to do the following:

Map<String, String> metricsMap = objectMapper.readValue(response, Map.class);

you might encounter the following exception:

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

You can solve the problem by using `TypeReference` as follows:

  private final TypeReference<Map<String, String>> metricsType
      = new TypeReference<Map<String, String>>() {};

Map<String, String> metricsMap = objectMapper.readValue(response, metricsType);