Birt Global Integer

Question

Hi there I have a Birt Report which read some stuff from a database. After that i want to increment a global Integer for every Detailrow that is loaded. So far i have initialized a global Integer with the following lines:

importPackage(Packages.java.lang);
reportContext.setPersistentGlobalVariable("minTotalPlus", new Integer(0));

After that i added the following line into a field in my detail row:

reportContext.setGlobalVariable("minTotalPlus",  new Integer reportContext.getGlobalVariable("minTotalPlus")) + 1);

When i preview the report i get an "java.lang.NumberFormatException: null" which means that the global variable is null. Why is that so? How could I fix that?

Answer 1

Dont' declare variables like that in the initialize method declare the like the following materiales=0; tools=0;

then in the fetch method use the following tools++;

...etc.