The @EJB is used to inject EJB’s only and is available for quite some time now. @Inject can inject any managed bean and is a part of the new CDI specification (since Java EE 6). In simple cases you can simply change @EJB to @Inject. In more advanced cases (e.g. when you heavily depend on … Read more
The jar file may be corrupt. Try removing the content of the following folder: C:\Users\[username]\.m2\repository Then right click your project, select Maven, Update Project, check on Force Update of Snapshots/Releases.
(Updated Feb 2022) First of all, “Java EE” has since Sep 2019 been renamed to “Jakarta EE“, starting with version 8. Historically, there was also the term “J2EE” which covered versions 1.2 until 1.4. The term “Java EE” covered versions 5 until 8. See also Jakarta EE, History on Wikipedia. Is Jakarta EE just a … Read more
Resin 3.0 documents this behavior: load-on-startup can specify an (optional) integer value. If the value is 0 or greater, it indicates an order for servlets to be loaded, servlets with higher numbers get loaded after servlets with lower numbers. The JSP 3.1 spec (JSR 340) says this on page 14-160: The element load-on-startup indicates that … Read more
You can indeed not define the filter execution order using @WebFilter annotation. However, to minimize the web.xml usage, it’s sufficient to annotate all filters with just a filterName so that you don’t need the <filter> definition, but just a <filter-mapping> definition in the desired order. For example, @WebFilter(filterName=”filter1″) public class Filter1 implements Filter {} @WebFilter(filterName=”filter2″) … Read more
You would do that when the responsibility of creating/updating the referenced column isn’t in the current entity, but in another entity.
I’m very new to Java EE and I’m trying to understand the concept of Local interfaces and Remote interfaces. In the initial versions of the EJB specification, EJBs were “assumed” to be remote components and the only way to invoke them was to make a remote call, using RMI semantics and all the overhead it … Read more
I had the exact same problem. [ERROR] Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.5: Failure to find org.apache.maven.plugins:maven-resources-plugin:pom:2.5 in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> … Read more
Spring is an IoC container (at least the core of Spring) and is used to wire things using dependency injection. Spring provides additional services like transaction management and seamless integration of various other technologies. Struts is an action-based presentation framework (but don’t use it for a new development). Struts 2 is an action-based presentation framework, … Read more
UPDATED For IntelliJ IDEA 12+ releases we can build automatically the edited sources if we are using the external compiler option. The only thing needed is to check the option “Build project automatically“, located under “Compiler” settings: Also, if you would like to hot deploy, while the application is running or if you are using … Read more