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set proxy system properties

System.getProperties().put("http.proxyHost", "someProxyURL");
System.getProperties().put("http.proxyPort", "someProxyPort");

-Dhttp.proxyHost=127.0.0.1 -Dhttp.proxyPort=3128 -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=3129

execute application from java, execute sub-process, start program

start and waiting for finish

new ProcessExecutor().commandSplit(executeLine).execute();

start in separate process without waiting

new ProcessExecutor().commandSplit(executeLine).start();

with specific directory

new ProcessExecutor().commandSplit(executeLine).directory(executableFile.getParentFile()).start();

@Null

use Optional.absent

locking

Reentrant lock == Semaphore

jshell

print import

/!

help

/help
/?

exit

/exit

JAR

create jar based on compiled files

jar cf WC2.jar *.class

take a look into jar

jar tf WC2.jar

print loaded classes during start application

java -verbose app

LOG4j

log4j configuration key for JVM

-Dlog4j.configuration={path to file}

log4j override configuration from code

Properties props = new Properties();
props.put("log4j.rootLogger", level+", stdlog");
props.put("log4j.appender.stdlog", "org.apache.log4j.ConsoleAppender");
props.put("log4j.appender.stdlog.target", "System.out");
props.put("log4j.appender.stdlog.layout", "org.apache.log4j.PatternLayout");
props.put("log4j.appender.stdlog.layout.ConversionPattern","%d{HH:mm:ss} %-5p %-25c{1} :: %m%n");
// Execution logging
props.put("log4j.logger.com.hp.specific", level);
// Everything else 
props.put("log4j.logger.com.hp", level);
LogManager.resetConfiguration();
PropertyConfigurator.configure(props);

log4j file configuration

<?xml version="1.0" encoding="UTF-8"?>
    <Configuration status="WARN">
      <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
          <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
      </Appenders>
      <Loggers>
        <Logger name="com.foo.Bar" level="debug">
          <AppenderRef ref="Console"/>
        </Logger>
        <Root level="debug">
          <AppenderRef ref="Console"/>
        </Root>
      </Loggers>
    </Configuration>

log4j update configuration during runtime, refresh configuration

<?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorInterval="30">
...
</Configuration>

hsqldb Oracle dialect

driverClassName="org.hsqldb.jdbc.JDBCDriver"
url="jdbc:hsqldb:mem:test;sql.syntax_ora=true"
username="sa" password=""

liquibase

liquibase print sql scripts ( update sql )

java -jar C:\soft\maven-repo\org\liquibase\liquibase-core\3.4.1\liquibase-core-3.4.1.jar  \
--driver=oracle.jdbc.OracleDriver --classpath=C:\soft\maven-repo\com\oracle\ojdbc6\11.2.0.2.0\ojdbc6-11.2.0.2.0.jar  \
--changeLogFile=C:\temp\liquibase\brand-server\master.xml  \
--contexts="default" \
--url=jdbc:oracle:thin:@q-ora-db-scan.wirecard.sys:1521/stx11de.wirecard --username=horus_user_cherkavi --password=horus_user_cherkavi \
 updateSQL > script.sql

liquibase test scripts against H2 database

java -jar liquibase-core-3.5.5.jar  --driver=org.h2.Driver --classpath=h2-1.4.197.jar --changeLogFile=C:\project\opm\opm-persistence\src\main\resources\db\changelog\changes.xml --url=jdbc:h2:mem:testdb;Mode=Oracle --username=sa --password=  update

flyway

commandline documentation

folder structure

/-<root>
  /drivers
  /jars
  /scripts
  /sql

execute flyway from commandline, db info

java -cp flyway-core-4.0.3.jar;flyway-commandline-5.1.3.jar org.flywaydb.commandline.Main -configFile=flyway-info.conf info

to see debug log, need to add next jars into classpath:

  • slf4j-api-1.7.25.jar
  • log4j-to-slf4j-2.10.0.jar
  • log4j-core-2.10.0.jar
  • log4j-api-2.10.0.jar
  • log4j-1.2.14.jar

config file example

flyway.driver=oracle.jdbc.OracleDriver
flyway.url=jdbc:oracle:thin:@vpn050.kabel.de:1523:PMDR
flyway.user=login
flyway.password=pass
flyway.locations=filesystem:../fixnet-data/,classpath:db.migration.initialize

execute flyway with command line parameters

flyway migrate -driver=oracle.jdbc.OracleDriver -url=jdbc:oracle:thin:@vs050:1523:PMDR -user=xnet -password=xnet -locations=filesystem:/opt/oracle/scripts"

flyway table with current migration status

select * from {schema name}."schema_version";

update schema name with "success" flag

update {schema name}."schema_version" set "success"=1 where "version"='3.9';

update from java code, custom update from code,

package db.migration.initialize;
import org.flywaydb.core.api.migration.jdbc.JdbcMigration;
public class V1_9_9__insert_initial_gui_configurations implements JdbcMigration {
    @Override
    public void migrate(Connection connection) throws Exception
}

<location>classpath:db.migration.initialize</location>

java application debug, remote debug

-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=9010

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=9010
-Dcom.sun.management.jmxremote.local.only=false
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false

JNDI datasource examples:

   <Resource name="ds/JDBCDataSource" auth="Container"
              type="javax.sql.DataSource" 
              driverClassName="org.h2.Driver"
              url="jdbc:h2:~/testdb;Mode=Oracle"
              username="sa" 
              password="" maxActive="20" maxIdle="10"
              maxWait="-1"/>

   <Resource name="ds/JDBCDataSource" auth="Container"
              type="javax.sql.DataSource" 
              driverClassName="org.hsqldb.jdbc.JDBCDriver"
              url="jdbc:hsqldb:mem:test;sql.syntax_ora=true"
              username="sa" 
              password="sa" maxActive="20" maxIdle="10"
              maxWait="-1"/>

WildFly

check health of application

<host:port>/<application>/node

Java Testing

insert private fields

ReflectionUtils.makeAccessible(id);
ReflectionUtils.setField(id, brand, "myNewId");

order of tests execution

@FixMethodOrder

rest testing

RestAssured
body("brands.size()")

Sonar

skip checking by code checker

// NOSONAR

Hibernate

@Modifying

for custom queries only

force joining

@WhereJoinTable

inheritance types

- table per hierarchy ( SINGLE_TABLE )
- table per sub-class ( JOINED )
- table per class ( TABLE_PER_CLASS )

Vaadin

custom components

spring integration

horizontal stepper, human progress line, to-do list

show frame

    void showFrame(File file){
        Window window = new Window();
        window.setWidth("90%");
        window.setHeight("90%");
        BrowserFrame e = new BrowserFrame("PDF File", new FileResource(file));
        e.setWidth("100%");
        e.setHeight("100%");
        window.setContent(e);
        window.center();
        window.setModal(true);
        UI.getCurrent().addWindow(window);
    }

debug window

http://localhost:8090/?debug

Derby

into 'bin' folder add two variables for all scripts:

 export DERBY_INSTALL=/dev/shm/db/db-derby-10.14.2.0-bin/ 
 export DERBY_HOME=/dev/shm/db/db-derby-10.14.2.0-bin/

start with listening all incoming request ( not from localhost )

./startNetworkServer -h vldn338

create DB before using, from jdbc url

jdbc:derby://vldn338:1527/testDB;create=true

maven dependency

<dependency>
    <groupId>org.apache.derby</groupId>
    <artifactId>derbyclient</artifactId>
    <version>10.14.2.0</version>
</dependency>

jdbc

Driver: org.apache.derby.jdbc.ClientDriver
jdbc: jdbc:derby://vldn338:1527/dbName
user: <empty>
pass: <empty>

Activiti

user guide

eclipse plugin

additional documentation

create/init DB

activiti-engine-x.x.x.jar/org/activiti/db/create/activiti.create.sql

email, e-mail, smtp emulator

FakeSMTP

java -jar fakeSMTP.jar --help

run example:

java -jar fakeSMTP.jar -s -b -p 2525 -a 127.0.0.1  -o output_directory_name

e-mail server smtp, pop3, imap with SSL

MailServer

java -Dgreenmail.smtp.hostname=0.0.0.0 -Dgreenmail.smtp.port=2525 -Dgreenmail.pop3.hostname=0.0.0.0 -Dgreenmail.pop3.port=8443 -Dgreenmail.users=Vitali.Cherkashyn:[email protected],user:[email protected] -jar  greenmail-standalone-1.5.7.jar

WebLogic REST management

using REST services

list of all DataSources:

curl -X GET http://host:7001/management/wls/latest/datasources

return all accessible parameters for request

curl -X OPTION http://host:7001/management/wls/latest/datasources

request with authentication ( where magic string is "username:password" in base64 )

curl -H "Authorization: Basic d2VibG9naWM6d2VibG9naWMx" -X GET http://host:7001/management/wls/latest/datasources

request with authentication

curl --user username:password -X GET http://host:7001/management/wls/latest/datasources

description of one DataSource:

curl -X GET http://host:7001/management/wls/latest/datasources/id/{datasourceid}

domain runtime

curl --user weblogic:weblogic1  -X GET http://host:7001/management/weblogic/latest/domainRuntime

server parameters, server folders, server directories, server status, server classpath

curl --user weblogic:weblogic1  -X GET http://host:7001/management/weblogic/latest/domainRuntime/serverRuntimes

list of deployments

curl -v --user weblogic:weblogic1 -H X-Requested-By:MyClient -H Accept:application/json -X GET http://host:7001/management/wls/latest/deployments

list of applications

curl --user weblogic:weblogic1 -H Accept:application/json -X GET http://host:7001/management/wls/latest/deployments/application

info about one application

curl --user weblogic:weblogic1 -H Accept:application/json -X GET http://host:7001/management/wls/latest/deployments/application/id/userappname-gui-2018.02.00.00-SPRINT-7

remove application, undeploy application, uninstall application

curl --user weblogic:weblogic1 -H X-Requested-By:weblogic -H Accept:application/json -X DELETE http://host:7001/management/wls/latest/deployments/application/id/userappname-gui-2018.02.00.00-SPRINT-7

deploy application

curl -X POST --user weblogic:weblogic1 -H X-Requested-By:weblogic -H Accept:application/json -H Content-Type:application/json [email protected] http://host:7001/management/wls/latest/deployments/application

{
    "name":"userappname-gui-2018.02.00.00-SPRINT-7"
   ,"deploymentPath":"/opt/oracle/domains/pportal_dev/binaries/userappname-gui-2018.02.00.00-SPRINT-7.war"
   , "targets": ["pportal_group"]
}