Databases
StackOverflow2013
Postsdbo
POFilters - Servlets and Spring beans integration NullPointerException
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POFilters - Servlets and Spring beans integration NullPointerException
    primarykey
    data
    text
    <p>I have filter executes before servlet:</p> <pre><code> public class UserFilter implements Filter { List&lt;String&gt; sessionIdsList; WebContentDAOIF webContentDAOIF; public void setWebContentDAOIF(WebContentDAOIF webContentDAOIF) { this.webContentDAOIF = webContentDAOIF; } @Override public void init(FilterConfig arg0) throws ServletException { sessionIdsList = new ArrayList&lt;String&gt;(); sessionIdsList = webContentDAOIF.fetchAllSessionIds(); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { System.out.println("List size: " + sessionIdsList.size()); HttpServletRequest httpRequest = (HttpServletRequest)request; HttpSession session = httpRequest.getSession(); String userSessionId = session.getId(); System.out.println("Filter: " + userSessionId); if(sessionIdsList.size() !=0 &amp;&amp; sessionIdsList.contains(userSessionId)) { System.out.println("There is same sessionID"); } else { System.out.println("Hello anonim"); } RequestDispatcher dispatcher = request.getRequestDispatcher("main"); dispatcher.forward(request, response); } @Override public void destroy() { } } </code></pre> <p>And I have spring context xml file where I declare all my beans:</p> <pre><code>&lt;bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"&gt; &lt;property name="driverClassName"&gt;&lt;value&gt;com.mysql.jdbc.Driver&lt;/value&gt;&lt;/property&gt; &lt;property name="url"&gt;&lt;value&gt;jdbc:mysql://localhost:3306/contentDB&lt;/value&gt;&lt;/property&gt; &lt;property name="username"&gt;&lt;value&gt;root&lt;/value&gt;&lt;/property&gt; &lt;property name="password" &gt;&lt;value&gt;25051988&lt;/value&gt;&lt;/property&gt; &lt;/bean&gt; &lt;bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource"&gt;&lt;/property&gt; &lt;property name="mappingResources"&gt; &lt;list&gt; &lt;value&gt;user.hbm.xml&lt;/value&gt; &lt;value&gt;userEvents.hbm.xml&lt;/value&gt; &lt;/list&gt; &lt;/property&gt; &lt;property name="hibernateProperties"&gt; &lt;props&gt; &lt;prop key="hibernate.hbm2ddl.auto"&gt;update&lt;/prop&gt; &lt;prop key="hibernate.dialect"&gt;org.hibernate.dialect.MySQLDialect&lt;/prop&gt; &lt;prop key="hibernate.show_sql"&gt;true&lt;/prop&gt; &lt;prop key="hibernate.max_fetch_depth"&gt;3&lt;/prop&gt; &lt;prop key="hibernate.jdbc.fetch_size"&gt;50&lt;/prop&gt; &lt;prop key="hibernate.jdbc.batch_size"&gt;15&lt;/prop&gt; &lt;/props&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="webContentDAOImpl" class="demidov.pkg.persistence.WebContentDAOImpl"&gt; &lt;property name="sessionFactory" ref="sessionFactory"/&gt; &lt;/bean&gt; &lt;tx:annotation-driven/&gt; &lt;bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"&gt; &lt;property name="sessionFactory" ref="sessionFactory"/&gt; &lt;/bean&gt; &lt;bean id="userFilter" class="demidov.pkg.web.UserFilter"&gt; &lt;property name="webContentDAOIF" ref="webContentDAOImpl"/&gt; &lt;/bean&gt; </code></pre> <p>I also have filter declared in my web.xml:</p> <pre><code> &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/*-context.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;filter&gt; &lt;filter-name&gt;userFilter&lt;/filter-name&gt; &lt;filter-class&gt;demidov.pkg.web.UserFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;userFilter&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;servlet&gt; &lt;servlet-name&gt;initialContentRendering&lt;/servlet-name&gt; &lt;servlet-class&gt;demidov.pkg.web.InitialContentRendering&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;initialContentRendering&lt;/servlet-name&gt; &lt;url-pattern&gt;/main&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet&gt; &lt;servlet-name&gt;orderEventServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;demidov.pkg.web.OrderEventServlet&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;orderEventServlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/event&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>But when I load application it says me:</p> <pre><code> SEVERE: Exception starting filter userFilter java.lang.NullPointerException at demidov.pkg.web.UserFilter.init(UserFilter.java:35) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:273) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:254) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:372) at org.apache.catalina.core.ApplicationFilterConfig.&lt;init&gt;(ApplicationFilterConfig.java:98) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4562) at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5240) at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5235) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724) </code></pre> <p>Please help me what I'm doing wrong. Thank you folks.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USVad
    1. USVad
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COplease past complete filter class.
      singulars
      1. POFilters - Servlets and Spring beans integration NullPointerException
      1. USKalher
    2. COYes Sir. I edit filter class on the top of my question
      singulars
      1. POFilters - Servlets and Spring beans integration NullPointerException
      1. USVad
    3. COPaste line 35 in your IDE to the end of this question. In your code sample line 35 is a blank line.
      singulars
      1. POFilters - Servlets and Spring beans integration NullPointerException
      1. USJason Nichols
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload