Gradle Application Plugin – APP_HOME in applicationDefaultJvmArgs
In Gardle, the application plugin, you can pass the system properties via applicationDefaultJvmArgs : gradle.build apply plugin:’application’ mainClassName = "com.mkyong.analyzer.engine.hydra.entryPointForJar" applicationName = ‘analyzer’ distZip { archiveName ‘analyzer-‘ + version + ‘.zip’ } applicationDefaultJvmArgs = ["-Dlogback.configurationFile=logback.xml"] The problem is how to get the APP_HOME for logback.xml? gradle.build applicationDefaultJvmArgs =… Continue Reading
distzip gradle
Spring MVC – Beans loaded twice
A Spring MVC web application, noticed all the Spring’s beans are loaded twice!? package com.mkyong.config.db; @Configuration public class MongoDevConfig { private final static Logger logger = LoggerFactory.getLogger(MongoDevConfig.class); @Bean MongoDbFactory mongoDbFactory() throws Exception { logger.debug("Init…… MongoDbFactory() in production mode!"); //… return new new SimpleMongoDbFactory(mongo, "db");; }… Continue Reading
spring mvc Spring Data MongoDB – Select fields to return
In MongoDB console, you can use field:1 to select the fields to return from a query : > db.hosting.find({},{domain:1, count:1}); In Spring Data for MongoDB, you use query.fields().include : HostingDaoImpl.java package com.mkyong.core.hosting.dao; import java.util.List; import org.springframework.data.domain.Sort; import org.springframework.data.mongodb.core.query.Criteria; import org.springframework.data.mongodb.core.query.Query; import org.springframework.data.mongodb.core.query.Update; import org.springframework.stereotype.Repository; import com.hostingcompass.core.db.dao.MongoDaoImpl; @Repository public… Continue Reading
mongodb spring-data Gradle War Plugin – Change output WAR filename
In Gradle, the WAR plugin will generate the final WAR file with the following pattern: ${baseName}-${appendix}-${version}-${classifier}.${extension} Example : hello.1.0.war To change the default WAR filename, update war.archiveName. For example : build.gradle project(':web’) { apply plugin: ‘war’ war { archiveName ‘hello-gradle.war’ } dependencies { compile project(':core’) providedCompile… Continue Reading
gradle war
How to pass System Properties in web.xml
In Java standalone application, you can use -D option to pass in the system properties : $ java -Dgeoip.file="/home/mkyong/geoip/test.db" test.jar In Java web application, you can pass the system properties via context-param in web.xml : web.xml <web-app> <context-param> <param-name>geoip.file</param-name> <param-value>/home/mkyong/geoip/test.db</param-value> </context-param> </web-app>
web.xml Spring @Value – Import a list from properties file
In this tutorial, we will show you how to import a “List” from a properties file, via Spring EL @Value Tested with : Spring 4.0.6 JDK 1.7 Spring @Value and List In Spring @Value, you can use the split() method to inject the ‘List” in one line. config.properties server.name=hydra,zeus server.id=100,102,103… Continue Reading
list properties file spring Spring @PropertySource example
In Spring, you can use @PropertySource annotation to externalize your configuration to a properties file. In this tutorial, we will show you how to use @PropertySource to read a properties file and display the values with @Value and Environment. P.S @PropertySource has been available since Spring 3.1 1. @PropertySource and… Continue Reading
spring spring3 spring4 Spring @Value default value
In this tutorial, we will show you how to set a default value for @Value 1. @Value Examples To set a default value in Spring expression, use Elvis operator : #{expression?:default value} Few examples : @Value("#{systemProperties[‘mongodb.port’] ?: 27017}") private String mongodbPort; @Value("#{config[‘mongodb.url’] ?: ‘127.0.0.1’}") private String mongodbUrl; @Value("#{aBean.age… Continue Reading
spring spring3
Multiple SSH private keys Examples
To allow multiple private keys connect to different servers, edit ~/.ssh/config : ~/.ssh/config Host 10.10.10.1 IdentityFile ~/.ssh/linode_rsa Host 200.20.20.2 IdentityFile ~/.ssh/id_rsa If you SSH to 10.10.10.1, private key ~/.ssh/linode_rsa will be used. If you SSH to 200.20.20.2, private key ~/.ssh/id_rsa will be used. 1. Single Private Key for Multiple… Continue Reading
private key public key ssh
MongoDB – Allow remote access
In this tutorial, we will show you how to enable remote access to a MongoDB server. Here is the tested environment : 1. MongoDB Server Private IP – 192.168.161.100 Public IP – 45.56.65.100 MongoDB 2.6.3, port 27017 IpTables Firewall 2. Application Server (Same LAN network) Private IP – 192.168.161.200 Public… Continue Reading
iptable mongodb remote access
Logback – different log file for each thread
In this tutorial, we will show you how to use Logback Mapped Diagnostic Context (MDC) and SiftingAppender to create a separate log file for each thread. P.S Tested with Logback 1.1.2, should work in earlier version. Note More info, refer to this Logback MDC documentation 1. logback.xml example A logback.xml… Continue Reading
logback mdc Spring – ${} is not working in @Value
A simple Spring @PropertySource example to read a properties file. db.properties db.driver=oracle.jdbc.driver.OracleDriver AppConfig.java @Configuration @PropertySource("classpath:db.properties") public class AppConfig { @Value("${db.driver}") private String driver; But the property placeholder ${} is unable to resolve in @Value, if print out the driver variable, it will display string ${db.driver} directly, instead of “oracle.jdbc.driver.OracleDriver”.… Continue Reading
properties spring
Java – Get number of available processors
A code snippet to show you how to get the number of available processors / cores / CPUs in your environment. int processors = Runtime.getRuntime().availableProcessors(); System.out.println(processors); Output 8 P.S Tested with Intel(R) Core(TM) i7-4770 CPU @3.40GHz
java java tips
How to change Eclipse theme
In this tutorial, we will show you how to change the Eclipse Theme. Tools used : Eclipse 4.4 Luna, works on earlier version. Eclipse Color Theme Plugin Figure : This is how your final Eclipse IDE looks like 1. Install Eclipse Color Theme Plugin Install the theme plugin and restart… Continue Reading
eclipse eclipse tips theme Spring MVC Abstract Controller example
For self-reference, this article shows you how to create a Abstract class for Spring Controller, or a template method design pattern. 1. Abstract Controller In Abstract class, the @Controller annotation is optional, your implemented class will apply it. AbstractResultController.java package com.mkyong.web.controller; import java.util.Map; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.PathVariable;… Continue Reading
abstract controller spring
