About HttpServlet

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Forum
4

Spring Data JPA

.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java
Issue
4

Unexpected exception (Error 990) - NullPointerException

.VerfahrensuebersichtServlet.doPost(VerfahrensuebersichtServlet.java:74) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.apache
Forum
4

WebSphere Liberty Configuration

) at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service
Forum
4

Query Method NullPointerException on List iteration

] at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.35.jar:9.0 ... ) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.35.jar:9.0.35] at org.apache.catalina.core
Forum
3

Object belongs to another EntityManager - ERROR

.http.HttpServlet.service(HttpServlet.java:847) 10:29:15,009 ERROR [stderr] (http--10.23.3.98-8081-5
Forum
3

Problem upgrading

.servlet.http.HttpServlet.service(HttpServlet.java:729) [tomcat-embed-core-8.0.28.jar:8.0.28] at org
Forum
3

TemporalType injection with Calendar using JPA

) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.apache.catalina.core
Forum
2

Database is erased after deploying a new web application version

which extends HttpServlet is in the com.webapp.firstwebapp.services package. I've created the listener class
Forum
2

Eclipse/JPA database tutorial

="guestbook", urlPatterns={"/GuestServlet"}) public class GuestServlet extends HttpServlet { Add