JavaEE - WAR - Deployed :: How to read a file from resource directory [duplicate]

Question

I believe the "correct" way one is supposed to do this is getResourceAsStream() but it just doesn't seem to cut it.

My situation:

I have a web application in Java that will be eventually deployed to a few different web servers the possibilities are GlassFish, Tomcat, and WildFly. Currently I'm working on a mac with Netbeans and I have access to WildFly and GlassFish. The project is mavenized

What I need to do is read and write two different Excel files. One serves as a "template" and one serves as the output file. The application previously ran standalone and I'm trying to wrap it into a JSF web site.

I need to obtain an FileInputStream for my one of the methods and eventually create an output file which will be served back to the user via http.

From what I gather the appropriate way to do this is supposed to be:

XLSX File

/src/main/resources/ANALYSIS_template.xlsx

Location once compiled into WAR file :: WildFly

/usr/local/opt/wildfly-as/libexec/standalone/deployments/fleetForecast-1.0-SNAPSHOT.war/WEB-INF/classes/ANALYSIS_template.xlsx

Location once compiled into WAR file :: GlassFish

~/devel/fleetforecast/target/fleetForecast-1.0-SNAPSHOT/WEB-INF/classes/ANALYSIS_template.xlsx

Java Code

I think I've maybe managed to get an input stream to the file with the command:

InputStream is1 = getClass().getResourceAsStream("ANALYSIS_template.xlsx");

I've also tried ("/ANALYSIS_template.xlsx") by the way which behaves similarly. When I try to read from this input stream

try {
        is1.read();
    } catch (IOException ex) {
        Logger.getLogger(FleetBean.class.getName()).log(Level.SEVERE, null, ex);
    }

I get a java.lang.NullPointerException.

Caused by: java.lang.NullPointerException
    at org.mitre.fleetforecast.bean.FleetBean.<init>(FleetBean.java:57)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at java.lang.Class.newInstance(Class.java:433)
    at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:186)
    ... 76 more

Any assistance offered or thought of would be greatly appreciated.

Answer 1

In the end it looks like this is the code that did the trick. I have NO idea why but apparently it worked and I'm not complaining.

InputStream inputStream = getClass().getClassLoader()
                         .getResourceAsStream("/ANALYSIS_template.xlsx");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

I made a new project form scratch and this code worked. Thanks for the help guys!