Problem: Exception thrown when running report

The below error is returned when trying to run a report:

      SEVERE: An error happened while running the report. Cause:
      java.lang.NullPointerException
      at java.util.Hashtable.put(Hashtable.java:396)
      at java.util.Hashtable.put(Hashtable.java:396)
      at java.util.Hashtable.putAll(Hashtable.java:470)
      at org.eclipse.birt.data.engine.executor.DataSource.
      <init>(DataSource.java:76)at org.eclipse.birt.data.engine.
      executor.DataSourceFactory.
      getDataSource(DataSourceFactory.java:75)
      at org.eclipse.birt.data.engine.impl.
      PreparedOdaDSQueryOdaDSQueryExecutor.getDataSource
      (PreparedOdaDSQuery.java:241)

Solution:

Ensure that you have completed this below step:

Go to Menu -> Preferences -> Tomcat ->JVM Settings. On the classpath widow select the button directory and add in the full path to the EJBServer\project\properties directory for your stream.