Java - good, use till now, 7 years. SQL - good, use till now, 7 years. Servlets, JSP - middle, use till now, 4 years. JPA, Hibernate - good, use till now, 3 years. Spring - middle, used 7 month before, 3 years. EJB3 - middle, use till now, 7 month. SOAP, JAX-WS, JAXB - beginner, used 1 year before, 3 month GWT - beginner, used 1 year before, 3 month Google Guava Cache - beginner, use till now, 1 month XML-RPC - beginner, 1 year before, 1 month Red Hat OpenShift - middle, used 6 month before, 1 year. Redis NoSQL database - beginner, 3 year before, 1 month. Ehcache - middle, 2 year before, 2 months. CSS - middle, 12 months before, 2 years ZK Framework - middle, 4 years before, 1 year Ajax - good, use till now, 2 years PL/pgSQL - beginner, 4 years before, 1 year Swing - beginner, 4 years before, 2 years Groovy - beginner, 4 years before, 1 year LDAP - beginner, 3 year before, 1 year JBoss Application Server - middle, use till now, 2 years Apache Tomcat - middle, used 7 months before, 4 years JBoss EAP - beginner, use till now, 1 year Apache Camel - beginner, 4 year before, 1 month JasperReports - beginner, 3 years before, 2 weeks. Unit testing - good, use till now, 7 years MSSQL - middle, 2 years before, 5 years. PostgreSQL - good, use till now, 4 years. MySQL - middle, 1 year before, 2 years. Oracle - middle, 4 years before, 2 years. JavaScript - middle, use till now, 3 years. JQuery - middle, use till now, 1 year. Angular JS - beginner, 4 months before, 2 weeks. HTML - middle, use till now, 5 years. C# - beginner, 5 years before, 3 years. C,C++ - beginner, 5 years before, 1 year. Flash - beginner, more 8 years before, 2 years. Graphic design - middle, 1 year before, 3 years. IT-management - high, more 7 years before, 8 years. XML - good, use till now, 3 years Search engine optimization, SEO - middle, 12 months before, 3 years Windows administration - middle, use till now, 6 years. Unix administration - beginner, more 6 years before, 4 months. Liferay CMS - beginner, 2 years before, 3 months. AlloyUI Web Framework - beginner, 3 years before, 3 months. Vaadin Web Application Framework - beginner, 3 years before, 3 months. Apache Velocity template language - beginner, 3 year before, 4 months. Apache Ant - middle, 1 year before, 2 years. Apache Maven - middle, use till now, 3 years.