07 April 2016

Fowler's ideas

Interesting posts from Martin Fowler, most are his ideas, however there some that is referring to third idea... as usual, it is referenced correctly in his document:

- CQRS
- Event Sourcing
- Parallel Model
- ReportingDatabase
- BlueGreen Deployment
- Canary Release

...

22 March 2016

Portadas libros Educacion Aymara-Castellano

Continuando con la preservación de libros de proyecto OEA:

16 March 2016

Catastrophic Backtracking

RegExp Playground

This repository contains several regexp examples.

Examples

1. Catastrophic Backtracking

This is Java example of backtracking catastrophic shown in Coding Horror post This is a known behavior when using nesting repetition operators, that has been analyzed in stackoverlow, regular expressions dedicated sites.
It can be seen the exponential explosion that take to parse using regexp for a simple pattern:

(x+x+)y+

Details of this issue can be found on the above links.

Execute

mvn clean package
mvn exec:java -Dexec.mainClass="cl.devweb.regexp.exploit.CatastrophicBacktracking"

Rule of Thumb - Solution

The solution is simple. When nesting repetition operators, make absolutely sure that there is only one way to match the same match. If repeating the inner loop 4 times and the outer loop 7 times results in the same overall match as repeating the inner loop 6 times and the outer loop 2 times, you can be sure that the regex engine will try all those combinations.

OUTPUT

 mvn exec:java -Dexec.mainClass="cl.devweb.regexp.exploit.CatastrophicBacktracking"
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building regexp-exploit 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ regexp-exploit ---
Found value: xxxxxxxxxxxxxy  timer=113.2 μs
Invalid match of 1 chars took 20.97 μs
Invalid match of 2 chars took 14.28 μs
Invalid match of 3 chars took 21.82 μs
Invalid match of 4 chars took 149.2 μs
Invalid match of 5 chars took 26.92 μs
Invalid match of 6 chars took 43.73 μs
Invalid match of 7 chars took 80.80 μs
Invalid match of 8 chars took 135.6 μs
Invalid match of 9 chars took 207.1 μs
Invalid match of 10 chars took 240.6 μs
Invalid match of 11 chars took 442.9 μs
Invalid match of 12 chars took 848.0 μs
Invalid match of 13 chars took 1.623 ms
Invalid match of 14 chars took 2.504 ms
Invalid match of 15 chars took 4.339 ms
Invalid match of 16 chars took 8.163 ms
Invalid match of 17 chars took 16.60 ms
Invalid match of 18 chars took 33.27 ms
Invalid match of 19 chars took 69.98 ms
Invalid match of 20 chars took 138.2 ms
Invalid match of 21 chars took 268.9 ms
Invalid match of 22 chars took 537.9 ms
Invalid match of 23 chars took 977.8 ms
Invalid match of 24 chars took 2.132 s
Invalid match of 25 chars took 4.260 s
Invalid match of 26 chars took 8.433 s
Invalid match of 27 chars took 17.18 s
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 34.977 s
[INFO] Finished at: 2016-03-16T12:38:59-03:00
[INFO] Final Memory: 9M/245M
[INFO] ------------------------------------------------------------------------

We can see taking a Thread Dump, where is spending (wasting?) most of the time:

"main" #1 prio=5 os_prio=31 tid=0x00007f8f9a006000 nid=0x1303 runnable [0x000000010a718000]
   java.lang.Thread.State: RUNNABLE
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4785)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4717)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:4272)
    at java.util.regex.Pattern$Curly.match(Pattern.java:4234)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4658)
    at java.util.regex.Pattern$Loop.matchInit(Pattern.java:4801)
    at java.util.regex.Pattern$Prolog.match(Pattern.java:4741)
    at java.util.regex.Pattern$Start.match(Pattern.java:3461)
    at java.util.regex.Matcher.search(Matcher.java:1248)
    at java.util.regex.Matcher.find(Matcher.java:637)
    at cl.devweb.regexp.exploit.CatastrophicBacktracking.main(CatastrophicBacktracking.java:81)

TODO

add more examples :)

License

MIT . .

15 March 2016

Maven Cheat Sheet

Some reminder for Maven:

mvn clean package -DskipTests -Dmaven.javadoc.skip=true -Dhttps.protocols=TLSv1.2

1. Use a different settings.xml

mvn --settings ~/.m2/YourOwnSettings.xml clean install

mvn -s ~/.m2/YourOwnSettings.xml clean install

2. Jboss tasks:

mvn jboss-as:deploy
mvn jboss-as:redeploy
mvn jboss-as:undeploy

3. Eclipse Maven clean:
(retired)

mvn eclipse:eclipse
mvn eclipse:clean
mvn install

4. set java version:

<project>
[...]
<build>
[...]
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.4</source>
<target>1.4</target>
</configuration>
</plugin>
</plugins>
[...]
</build>
[...]
</project>

5. Missing Maven dependencies in Eclipse Project

   workaround to have an eclipse maven project

6. basic maven structure

src/main/java

- src
    - main
          - java
          - resources
          - webapp
     - test
          - java
          - resources

- target

7. packaging:

<packaging>jar</packaging>

8. executing from maven:

add the following plugin to pom.xml:

<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>com.myorganisationname.common.App</mainClass>
</configuration>
<arguments> -Dlog4j.configurationFile=/tmp/log4j2.xml </arguments> <classpathScope>test</classpathScope>
</plugin>

and run it with:

mvn exec:java

9. skipping test:

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>

or

      mvn install -DskipTests

or

     mvn install -Dmaven.test.skip=true

10. Multiple Module Projects

<packaging>pom</packaging>

<modules>
<module>guide-ide-eclipse-site</module>
<module>guide-ide-eclipse-core</module>
<module>guide-ide-eclipse-module1</module>
</modules>

Add the parent to the POMs of the new modules:

<parent>
<groupId>guide.ide.eclipse</groupId>
<artifactId>guide-ide-eclipse</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>

mvn install
mvn eclipse:eclipse

http://maven.apache.org/plugins/maven-eclipse-plugin/reactor.html

11. web archetype

mvn archetype:generate -DgroupId=cl.devweb -DartifactId=wls_log_retrieval -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false

12. copy dependencies:

 mvn dependency:copy-dependencies -DoutputDirectory=OUTPUT_DIR

13. tomcat

mvn tomcat7:deploy
mvn tomcat7:undeploy
mvn tomcat7:redeploy

14. verbose class

mvn test -DjvmArgs="-verbose:class"

15. web.xml-less
(servlet 3.0+)


<plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-war-plugin</artifactId>
 <version>2.6</version>
 <configuration>
  <failOnMissingWebXml>false</failOnMissingWebXml>
 </configuration>
</plugin>

16. weblogic

              mvn com.oracle.weblogic:weblogic-maven-plugin:deploy


           mvn com.oracle.weblogic:weblogic-maven-plugin:undeploy


            <plugin>
                <groupId>com.oracle.weblogic</groupId>
                <artifactId>weblogic-maven-plugin</artifactId>
                <version>12.1.3-0-0</version>
                <configuration>
                    <adminurl>t3://127.0.0.1:7001</adminurl>
                    <user>weblogic</user>
                    <password>welcome1</password>
                    <upload>true</upload>
                    <action>deploy</action>
                    <remote>true</remote>
                    <verbose>true</verbose>
                    <source>target/${project.artifactId}.${project.packaging}</source>
                    <name>${project.artifactId}</name>
                    <targets>AdminServer</targets>
                </configuration>
            </plugin>

17. debug flag

mvn -X

mvn -e

18. update (when it does not find jar)
Use the -U flag to force Maven to update dependencies:

mvn -U package

19. dependencies

mvn dependency:tree

     -Dverbose

20. skip javadoc

-Dmaven.javadoc.skip=true

21. assigning different https protocol version :
(to avoid: Received fatal alert: protocol_version)

-Dhttps.protocols=TLSv1.2

22. identifying excluding dependencies

mvn dependency:tree -Dverbose -Dincludes=log4j:log4j

i.e.:

[German@KDU foo-ejemplo (feature/ggonzalez/refactoring)]$ mvn dependency:tree -Dverbose -Dincludes=org.springframework:spring-core
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------< cl.bar:foo-ejemplo >---------------
[INFO] Building foo-ejemplo 1.0.0
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ foo-ejemplo ---
[INFO] cl.bar:foo-ejemplo:war:1.0.0
[INFO] \- cl.bar.plataforma.common:foo-ejemplo-lib:jar:1.0.1:compile
[INFO]    +- org.springframework:spring-context:jar:4.2.1.RELEASE:compile
[INFO]    | +- org.springframework:spring-aop:jar:4.2.1.RELEASE:compile
[INFO]    | | \- (org.springframework:spring-core:jar:4.2.1.RELEASE:compile - omitted for duplicate)
[INFO]    | +- org.springframework:spring-beans:jar:4.2.1.RELEASE:compile
[INFO]    | | \- (org.springframework:spring-core:jar:4.2.1.RELEASE:compile - omitted for duplicate)
[INFO]    | +- org.springframework:spring-core:jar:4.2.1.RELEASE:compile
[INFO]    | \- org.springframework:spring-expression:jar:4.2.1.RELEASE:compile
[INFO]    |     \- (org.springframework:spring-core:jar:4.2.1.RELEASE:compile - omitted for duplicate)
[INFO]    \- org.springframework:spring-jdbc:jar:4.2.1.RELEASE:compile
[INFO]       +- (org.springframework:spring-core:jar:4.2.1.RELEASE:compile - omitted for duplicate)
[INFO]       \- org.springframework:spring-tx:jar:4.2.1.RELEASE:compile
[INFO]          \- (org.springframework:spring-core:jar:4.2.1.RELEASE:compile - omitted for duplicate)

23. Add local dependencies directly

<dependency>
<groupId>com.sample</groupId>
<artifactId>sample</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/resources/yourJar.jar</systemPath>
</dependency>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.0</version>
            <configuration>
                <failOnMissingWebXml>true</failOnMissingWebXml>
                <webResources>
                    <resource>
                       <directory>${project.basedir}/lib</directory>
                       <targetPath>WEB-INF/lib</targetPath>
                    </resource>
                </webResources>
            </configuration>
        </plugin>

24. purge local
to clean up old dependencies (when someone changes a library but didn't upgrade the version, so we have a stale version)

mvn clean dependency:purge-local-repository

25. maven options for -XX

export MAVEN_OPTS="-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/"

<plugins>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <configuration>
      <argLine>-Xms512m -Xmx512m -XX:PermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:MaxPermSize=512m</argLine>
    </configuration>
</plugin>
</plugins>

<properties>
<argLine>-Xms512m -Xmx512m -XX:PermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:MaxPermSize=512m</argLine>

26. sonar

mvn sonar:sonar -Dsonar.host.url=http://127.0.0.1:9000 -Dsonar.login=d676f79d8ba83cdcf69f38f8471f0284ee242e09

for remote server:
settings.xml:

<settings 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/xsd/settings-1.0.0.xsd">

   <pluginGroups>
        <pluginGroup>org.sonarsource.scanner.maven</pluginGroup>
   </pluginGroups>
   <profiles>
        <profile>
            <id>sonar</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                
                <sonar.host.url>
                    http://127.0.0.1:9000
                </sonar.host.url>
            </properties>
        </profile>
   </profiles>
</settings>

27. javadoc 8 issues

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar (attach-javadocs) on project foo-api-rest: MavenReportException: Error while creating archive:
[ERROR] Exit code: 1 - /Users/German/development/workspace-oepe/foo-api-rest/src/main/java/cl/bar/plataformacomercial/foo/api/aop/HttpUtil.java:20: warning: no description for @param
[ERROR]      * @param request
[ERROR]        ^

This can be solved: https://devwebcl.blogspot.com/2016/01/jdk8-self-closing-element-not-allowed.html

28. maven deploy nexus/azure artifacts
before configuring: settings.xml, Plugins, distributionManagement, snapshotRepository

mvn clean deploy

https://www.baeldung.com/maven-deploy-nexus

29. install a library in the local repo

mvn install:install-file -DgroupId=cl.devweb.rbac -DartifactId=test -Dversion=1.0.0 -Dfile=test-rbac.jar -Dpackaging=jar -DgeneratePom=true

30. list system properties from Maven:

mvn help:system

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-antrun-plugin</artifactId>
                <version>1.6</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                        <configuration>
                            <target>
                                <property environment="env" />
                                <echoproperties />
                            </target>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

31.
wsdl jar
to be tested jar wsdl client proxies :


                      <plugin>
                <groupId>org.jvnet.jax-ws-commons</groupId>
                <artifactId>jaxws-maven-plugin</artifactId>
                <version>2.3</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>wsimport</goal>
                        </goals>
                        <configuration>
                            <wsdlDirectory>${basedir}/src/main/resources/wsdl/</wsdlDirectory>
                            <wsdlLocation>wsdl/endpoint_sample_wsdl.wsdl</wsdlLocation>
                            <sourceDestDir>${basedir}/src/main/java</sourceDestDir>

32.
list of licenses

mvn license:add-third-party

33. .m2 corrupt
Many times when there is a problem downloading jar files from any maven repository, the quick solution is to delete local reference at .m2.

34.
integration test (failsafe)

mvn verify

35.
Operating System (OS) profiles:

   <profiles>
     <profile>
        <id>Windows</id>
        <activation>
          <os>
            <family>Windows</family>
          </os>
        </activation>
        <properties>
          <script.extension>.cmd</script.extension>
        </properties>
      </profile>
      <profile>
        <id>unix</id>
        <activation>
          <os>
            <family>unix</family>
          </os>
        </activation>
        <properties>
          
          <script.extension></script.extension>
        </properties>
      </profile>
    </profiles>

36.
creates classpath

mvn dependency:build-classpath

37.
add new repositories to settings.xml
many maven repos have modular repos for release, snapshots, thirdparties...

<repositories>
   <repository>
       <id>maven-releases</id>
       <url>http://localhost:8081/repository/maven-releases/</url>
       <layout>default</layout>
       <releases>
           <enabled>true</enabled>
       </releases>
       <snapshots>
           <enabled>false</enabled>
       </snapshots>
   </repository>
   <repository>
       <id>maven-snapshots</id>
       <url>http://localhost:8081/repository/maven-snapshots/</url>
       <layout>default</layout>
       <releases>
           <enabled>false</enabled>
       </releases>
       <snapshots>
           <enabled>true</enabled>
       </snapshots>
   </repository>
   <repository>
       <id>thirdparty</id>
       <url>http://nexus.cl:8081/repository/thirdparty/</url>
       <layout>default</layout>
       <releases>
           <enabled>true</enabled> 
       </releases>
       <snapshots>
           <enabled>false</enabled>
       </snapshots>
   </repository>
</repositories>

38. hello world antrun
(and writing to a file a timestamp).

mvn antrun:run@tmp-echo

<execution>
    <id>tmp-echo</id>
    <phase>generate-resources</phase>
    <goals>
        <goal>run</goal>
    </goals>
    <configuration>
        <target>
            <tstamp>
                 <format property="last.updated" pattern="yyyy-MM-dd hh:mm:ss"/>
            </tstamp>
            <echo>Hello world!</echo>
            <echo message="${last.updated}"/>
            <concat destfile="log.txt" append="yes" fixlastline="yes">${last.updated}</concat>
            <concat destfile="log.txt" append="yes" fixlastline="yes">
                <path path="hola.txt"/>
            </concat>
        </target>
    </configuration>
</execution>

39. Owasp Dependency-check-maven
open source vulnerable libraries.

mvn dependency-check:check

            <plugin>
                <groupId>org.owasp</groupId>
                <artifactId>dependency-check-maven</artifactId>
                <version>5.2.4</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>check</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

40. Modernizer Maven Plugin
yet another static analyzer

<plugin>
<groupId>org.gaul</groupId>
<artifactId>modernizer-maven-plugin</artifactId>
<version>2.0.0</version>
<configuration>
    <javaVersion>1.8</javaVersion>
</configuration>
</plugin>

41. springboot startup

mvn spring-boot:run

42. javadoc plugin

mvn javadoc:javadoc

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>

43. Overriding managed version maven dependency

parent pom spring boot 2.x
version 1.x can override a version easily by replacing properties of a library:

<properties>
<json.version>20180130</json.version>
</properties>

however now with 2.0 it must be avoided to use parent starter and add manually each dependency. From 1, 2 & 3

<dependencyManagement>
<dependencies>
<dependency>
...
...
...

44. logging stdout
Maven can log with:

-l log file
--log-file log.txt

or using tee would be better (we can redirect stdout to a file)

mvn-all2.bat | tee /a log3.txt

45. profile command line
to execute a profile (by using the maven repository) use -P argument:

mvn clean package -P perfil

    <profiles>
        <profile>
            <id>perfil</id>
            <repositories>
                <repository>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <id>company-releases</id>
                    <name>company-releases</name>
                    <url>https://host:port/repository/maven-releases</url>
                </repository>

46. internal repository in pom.xml

<project>
...

<repositories>
   <repository>
         <id>my-internal-site</id>
         <url>http://myserver/repo</url>
    </repository>
</repositories>
...
</project>

47. docker

mvn clean install dockerfile:build

       <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>dockerfile-maven-plugin</artifactId>
            <version>1.4.0</version>
        </plugin>

48. jar without version

<build>
<finalName>${project.artifactId}</finalName>

49. jar executable

      <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-jar-plugin</artifactId>
   <version>3.2.0</version>
   <configuration>
       <archive>
         <manifest>
           <addClasspath>true</addClasspath>
           <classpathPrefix>lib/</classpathPrefix>
           <mainClass>cl.devweb.test.encrypt.Test1Json</mainClass>
         </manifest>
         </archive>
     </configuration>
     </plugin>

50. jar dependencies - fat jar

    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>cl.devweb.test.encrypt.Test1Json</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
    </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.3.0</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>

                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>

            </plugin>

51. copy resources

        <plugin>
            <artifactId>maven-resources-plugin</artifactId>
            <version>3.2.0</version>
            <executions>
                <execution>
                    <id>copy-resource-one</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-resources</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>C:/Users/germagon/tmp/tmp</outputDirectory>
                        <resources>
                            <resource>
                                <directory>target</directory>
                                <includes>
                                    <include>oci-cli-oke-fd-${version}-jar-with-dependencies.jar</include>
                                </includes>
                            </resource>
                        </resources>
                    </configuration>
                </execution>
            </executions>
        </plugin>

08 March 2016

Logging of class loading and unloading.

There are several useful system properties for JVM that are not very popular.

One of those is:

-verbose:class

Or:

-XX:+TraceClassLoading -XX:+TraceClassUnloading

This helps to printout all the jar files that are being used when running classes.

i.e.:

[Opened /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.Object from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.io.Serializable from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.Comparable from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.CharSequence from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.String from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.reflect.AnnotatedElement from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]
[Loaded java.lang.reflect.GenericDeclaration from /Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home/jre/lib/rt.jar]

Another approach is to printout in the code itself using ClassLoader (but this is more intrusive).

  ClassLoader cl = ClassLoader.getSystemClassLoader();

  URL[] urls = ((URLClassLoader)cl).getURLs();

  for(URL url: urls){
     System.out.println(">>>"+url.getFile());
  }

example:

>>> /Users/German/development/jars/HikariCP-java7-2.4.13.jar
>>> /Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/lib/tools.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/server/lib/weblogic_sp.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/server/lib/weblogic.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/oracle_common/modules/net.sf.antcontrib_1.1.0.0_1-0b3/lib/ant-contrib.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/modules/features/oracle.wls.common.nodemanager_2.0.0.0.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/oracle_common/modules/com.oracle.cie.config-wls-online_8.1.0.0.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/user_projects/domains/base_domain/
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/common/derby/lib/derbynet.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/common/derby/lib/derbyclient.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/common/derby/lib/derby.jar
>>> /Users/German/Oracle/Middleware/Oracle_Home/wlserver/server/lib/xqrl.jar
>>> /Users/German/bin/wlsdm.v3.1.1/jar/wlsdm_agent.jar

 

Always we can use the powerful lsof -p <pid>

02 March 2016

Sherlock Holmes Quotes

Interesting quotes from Sherlock Holmes:

From movie Mr. Holmes (2015)

I haven't a clue.
One can't solve everything.

From book A Scandal in Bohemia

It is a capital mistake to theorize before one has data

01 March 2016

TeX file to PDF

We have two easy ways to achieve this

1. Go to a longer (but safer) path:

tex --> dvi --> ps --> pdf

By using:

tex example.tex
dvips example.dvi
ps2pdf example.ps

(download: https://ctan.mines-albi.fr/web/cweb/cwebmac.tex
if necessary)

2. or using a straightforward tool:

pdftex example.tex

In both scenarios you'll get a PDF file.

Give it a try with several TeX files at Knuth's

(mac users: brew install --cask mactex )

29 February 2016

The Scrum Field Guide

I have won a free book from coderanch. After asking a politic question, I am going to receive it.
Interesting book, and even more interesting was the thread I had with the author (Mitch).

UPDATE1 (30.03.2016) I received the book

http://www.coderanch.com/t/662440/Agile/Scrum-Field-Guide-scope

http://www.coderanch.com/t/662632/Agile/Winners-Scrum-Field-Guide

Image from http://ecx.images-amazon.com

27 February 2016

Erase una vez...

Mandarinas y naranjas para las monjas de la granja, pan con queso para el diablo leso, esterines y esterones para los diablos orejones...

25 February 2016

Missing Maven dependencies in Eclipse Project

I have faced a couple of times this issue. There is a workaround that sometimes works, however it is not always true.

modify .classpath xml file, adding the following tag:

<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="org.eclipse.jst.component.nondependency" value=""/>
</attributes>
</classpathentry>

Several tips & tricks appear at: http://stackoverflow.com/questions/4262186/missing-maven-dependencies-in-eclipse-project

UPDATE1: another usual mistake is not to have the maven directory structure:

src/main/java

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