Dynamic for with Spring MVC using a HashMap
Sometime you need to dynamically generate a form without knowing how many fields it will be required (i.e. when your form is driven by a configuration or by some properties). […]
java
Results pagination with MongoDB and Java
To implement the MongoDB results pagination in Java, there are few parameters that need to be collected: 1) the order of results (ascending / descending) 2) the field used to […]
MongoDB query with logical and condition in Java
Suppose you need to apply some filters to your MongoDB query, for example to extract some _ids that match a regex condition. This is the way to do that: Query […]
dataSource: The name of the property, following JavaBean naming conventions.
Suppose you defined TemplateDao Spring bean in this way: <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property> <property name="url"><value>jdbc:mysql://${mysql.hostname}:${mysql.port}/${mysql.db}</value></property> <property name="username"><value>${mysql.user}</value></property> <property name="password"><value>${mysql.password}</value></property> </bean> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> […]
Velocity generates NullPointerException while evaluating template
While evaluating template with Velocity I am affecting a null point exception but happened only on production environment because it seems that the application is trying to write to tomcat/bin […]
Cannot nest ‘PRJ/src/main/resource’ inside ‘PRJ/src’
I created a new Web application using Eclipse and, after Enabling Maven, I get this error updating the project: Cannot nest ‘PRJ/src/main/resource’ inside ‘PRJ/src’. To enable the nesting exclude ‘main/’ […]
Spring-data: Cannot use a complex object as a key value
I was trying to figured out how to solve this issue. Basically I’m saving a user profile bean that contains multiple occurrences of other beans inside him. Something like date: […]
No suitable driver found for jdbc:mysql://localhost:3306/schema
If the exception “Could not get JDBC Connection; nested exception is java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/schema” is raised probably you forgot to add the <property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property><property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property> property […]
How to call a function whose name is stored in a string variable
The objective is simple, create a method which load a class dynamically, access its method and passing their parameters value and getting the return value at run-time. To do that […]
‘Must Override a Superclass Method’ Errors after importing a project into Eclipse
Eclipse is defaulting to Java 1.5, when you want it to use Java 1.6. You have classes implementing interface methods, which in Java 1.6 can be annotated with @Override; however, […]