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Java Class Compiles Normally By Itself, But Throws NoClassFoundException Or NoClassDefFoundError When Run Through A JSP

- 1 answer

I have a java class that successfully sends a Firebase message to my android phone. I am trying to run that class from a JSP file, but it results in NoClassFoundException and NoClassDefFoundError. Here is the JSP file:

<%@ page import="send.Notify" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    Api token is: <%
        out.print(request.getParameter("token"));
    %>
<%

Notify.SendMessage(request.getParameter("token"),"title","body");
%>
</body>
</html>

To be clear, I do get a normal output from out.print when Notify.SendMessage is commented out, so the problem isn't the input.

Here is my class:

package send;

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;
import com.google.firebase.messaging.FirebaseMessaging;
import com.google.firebase.messaging.Message;
import com.google.firebase.messaging.Notification
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Arrays;

public class Notify {
public static void main(String[] args) throws Exception{

    SendMessage("f7ne...",
            "title", "body");
}

public static void SendMessage(String registrationToken, String title, String body) throws Exception{
    FileInputStream serviceAccount =
            new FileInputStream("C:\\Users\\michael\\IdeaProjects\\servlet 3\\web\\notification-32ebc-firebase-adminsdk-5lbs4-643271e91a.json");

    FirebaseOptions options = new FirebaseOptions.Builder()
            .setCredentials(GoogleCredentials.fromStream(serviceAccount))
            .setDatabaseUrl("https://notification-32ebc.firebaseio.com")
            .build();

    FirebaseApp.initializeApp(options);

    Notification notification = new Notification(title, body);
    Message message = Message.builder()
            .setToken(registrationToken)
            .setNotification(notification)
            .build();


    String response = FirebaseMessaging.getInstance().send(message);
    System.out.println(response);
}
private static String getAccessToken() throws IOException {
    GoogleCredential googleCredential = GoogleCredential
            .fromStream(new FileInputStream("C:\\Users\\michael\\IdeaProjects\\servlet 3\\web\\notification-32ebc-firebase-adminsdk-5lbs4-643271e91a.json"))
            .createScoped(Arrays.asList("https://www.googleapis.com/auth/firebase.messaging",
                    "https://www.googleapis.com/auth/firebase.database",
                    "https://www.googleapis.com/auth/userinfo.email",
                    "https://www.googleapis.com/auth/firebase"));
    googleCredential.refreshToken();
    return googleCredential.getAccessToken();
}

}

Here is the error:

Type Exception Report

Message An exception occurred processing [/notification.jsp] at line [15]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing [/notification.jsp] at line [15]

12:         /*Notify.SendMessage("f7neXi6q4KQ:APA91bFI3acBwgtDq99_D2duax_qY1zAMGCE62yHQ5CsL-UhyJdvAs97CUhzXzY0q7tyWKX2JM0WlyvZtL-arTW9s1useO816ujda5c4gYKM-I_uCN8m81EH9clwNeVG6kQzGU-zl93k",
13:                 "jsp title", "jsp body");*/
14:         try{
15:             Notify.SendMessage(request.getParameter("token"),"title","body");
16:         }catch (Exception e){
17:             out.print("error!");
18:         }


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:593)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:467)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/google/firebase/FirebaseOptions$Builder
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:667)
    org.apache.jsp.notification_jsp._jspService(notification_jsp.java:154)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

java.lang.NoClassDefFoundError: com/google/firebase/FirebaseOptions$Builder
    send.Notify.SendMessage(Notify.java:26)
    org.apache.jsp.notification_jsp._jspService(notification_jsp.java:135)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

java.lang.ClassNotFoundException: com.google.firebase.FirebaseOptions$Builder
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1292)
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1121)
    send.Notify.SendMessage(Notify.java:26)
    org.apache.jsp.notification_jsp._jspService(notification_jsp.java:135)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Note The full stack trace of the root cause is available in the server logs.

Here is my folder structure: https://prnt.sc/jocl6h

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Answer

The problem was that Intellij doesn't use dependencies that you added to a project also to the tomcat server. To fix this, I manually added all the jars from my maven folder (C:\Users\user.m2) to the project/web/WEB-INF/lib folder.

It's a solution, but I'm still looking for the proper way to do it.

Update: I recently tried to refactor my program. In IntelliJ, create a new maven project from the apache webapp archetype. Then you can add all your dependencies and classes, and Tomcat will successfully find all of them.

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source: stackoverflow.com
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