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Deploying Spring MVC web app .war file in tomcat in openshift results in blank page


Deploying Spring MVC web app .war file in tomcat in openshift results in blank page

By : user2953019
Date : November 19 2020, 03:59 PM
wish of those help Finally I have solved the problem which was actually stated here. I have solved this with the help of this answer. And here is my implementation:
I have added a listener-class in my web.xml:
code :
<listener>
    <listener-class>
        az.quiz.utils.MyServletContext
    </listener-class>
</listener>
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;

public class MyServletContext implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("Context created");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

        Enumeration<Driver> drivers = DriverManager.getDrivers();
        while (drivers.hasMoreElements()) {
            Driver driver = drivers.nextElement();
            try {
                DriverManager.deregisterDriver(driver);
                System.out.println(String.format("deregistering jdbc driver: %s", driver));
            } catch (SQLException e) {
                System.out.println(String.format("Error deregistering driver %s", driver));
            }

        }
        System.out.println("Context destroyed");
    }
}


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Deploying war file on linux tomcat with spring

Deploying war file on linux tomcat with spring


By : Jayme Nogueira
Date : March 29 2020, 07:55 AM
hop of those help? I had same problem before. I remove the tomcat completely and reinstalled it, then it worked. try it.
OpenShift Tomcat Processing Annotations Error Deploying War

OpenShift Tomcat Processing Annotations Error Deploying War


By : alightergreen
Date : March 29 2020, 07:55 AM
hop of those help? So, to answer my own question, the issue appears to be with the latest version of javassist. We updated to the latest version as part of the last update, 3.19.0, and it looks like it's not compatible with Tomcat on OpenShift.Once I downgraded back to 3.17.1 all worked fine.
Just as a note to any OpenShift staff, it would really help if issues like this can be highlighted on the OpenShift support pages. Javassist 3.19.0 has been around for 5 months on maven and I can't imagine we were the first to encounter this issue.
shows blank page after deploying a grails war file on openshift

shows blank page after deploying a grails war file on openshift


By : garimuchi
Date : March 29 2020, 07:55 AM
it helps some times i have fixed the problem with the help i got from @Taras Kohut. i added the following lines to my BuildConfig.groovy file.
code :
 grails.project.war.exploded.dir = "/yourLocalPathToClonedOpenshiftFile/webapps/ROOT"
 grails.war.exploded=true
Spring boot 1.5.2 not deploying in Openshift Tomcat 7(JBoss EWS 2.0)

Spring boot 1.5.2 not deploying in Openshift Tomcat 7(JBoss EWS 2.0)


By : dvsv2
Date : March 29 2020, 07:55 AM
around this issue Try extending SpringBootServletInitializer in your main Spring-Boot Application class as below,
code :
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(DemoApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}
Error while deploying spring boot app on openshift cluster using S2I and using openshift/wildfly-101-centos7 base image

Error while deploying spring boot app on openshift cluster using S2I and using openshift/wildfly-101-centos7 base image


By : user3629215
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I deployed sample spring boot web application on openshift cluster using base image openshift/wildfly-101-centos7. During deployment phase I am getting bellow error in pod log. , You need to change the starter web dependency as:
code :
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-websocket</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>
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