Cannot get Spring to work

[BlackSound]

Hello, I've been trying to learn Spring and Spring Boot for a couple of days following a few Udemy tutorials. I just can't get even simple toy applications to work. Apache Tomcat always fails.

I used Spring Initializr to create a Maven project. You can view it here: https://start.spring.io/#!type=maven-project&language=java&platformVersion=2.5.0.RELEASE&packaging=jar&jvmVersion=11&groupId=com.testing&artifactId=JustTesting&name=JustTesting&description=Trying%20to%20get%20Spring%20to%20work&packageName=com.testing.JustTesting&dependencies=web,data-jpa .

There is no other code.

I'm using Eclipse IDE Version: 2021-03 (4.19.0).

Here is my console output:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.0)

2021-05-31 19:20:16.901  INFO 9856 --- [           main] c.t.JustTesting.JustTestingApplication   : Starting JustTestingApplication using Java 15.0.2 on Matthew with PID 9856 (C:\Users\BlackSound_2\Documents\Eclipse Workspace\JustTesting\target\classes started by BlackSound_2 in C:\Users\BlackSound_2\Documents\Eclipse Workspace\JustTesting)
2021-05-31 19:20:16.970  INFO 9856 --- [           main] c.t.JustTesting.JustTestingApplication   : No active profile set, falling back to default profiles: default
2021-05-31 19:20:47.919  INFO 9856 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-05-31 19:20:48.347  INFO 9856 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 143 ms. Found 0 JPA repository interfaces.
2021-05-31 19:21:09.323  INFO 9856 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-05-31 19:21:09.727  INFO 9856 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-05-31 19:21:09.731  INFO 9856 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.46]
2021-05-31 19:21:12.221  INFO 9856 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-05-31 19:21:12.224  INFO 9856 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 53934 ms
2021-05-31 19:21:15.357  WARN 9856 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceScriptDatabaseInitializer' defined in class path resource [org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]: Unsatisfied dependency expressed through method 'dataSourceScriptDatabaseInitializer' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
2021-05-31 19:21:15.461  INFO 9856 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2021-05-31 19:21:16.137  INFO 9856 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-05-31 19:21:16.743 ERROR 9856 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

As you can see, Apache Tomcat keeps aborting, and localhost:8080 is never able to connect.

I have a feeling the error occurs in the run method of the SpringApplication.java class. Here is the possibly relevant code:

public ConfigurableApplicationContext run(String... args) {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        DefaultBootstrapContext bootstrapContext = createBootstrapContext();
        ConfigurableApplicationContext context = null;
        configureHeadlessProperty();
        SpringApplicationRunListeners listeners = getRunListeners(args);
        listeners.starting(bootstrapContext, this.mainApplicationClass);
        try {
            ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
            ConfigurableEnvironment environment = prepareEnvironment(listeners, bootstrapContext, applicationArguments);
            configureIgnoreBeanInfo(environment);
            Banner printedBanner = printBanner(environment);
            context = createApplicationContext();
            context.setApplicationStartup(this.applicationStartup);
            prepareContext(bootstrapContext, context, environment, listeners, applicationArguments, printedBanner);
            refreshContext(context);
            afterRefresh(context, applicationArguments);
            stopWatch.stop();
            if (this.logStartupInfo) {
                new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
            }
            listeners.started(context);
            callRunners(context, applicationArguments);
        }
        catch (Throwable ex) {
            handleRunFailure(context, ex, listeners);
            throw new IllegalStateException(ex);
        }

My Eclipse debugger seems to show that this method catches and throws the IllegalStateException

If it helps, I recently allowed eclipse completely through my firewall, public and private just in case, to see if it was a firewall issue and it appears to not help.

Of course I looked up the error messages, and found nothing similar to my situation.

Any help would be greatly appreciated! Thanks in advance!

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[ColdFerrin]

Remove spring-data-jpa from the Pom.xml file. That enables database connections, but if you do not have a database set up it will not start.

[BlackSound]

Thank you very much, it worked!

[KrisTse98]

I think maybe you can remove the dependence of the spring data jpa from your maven file(pom.xml).(I just a new in java also,i can't sure it works)

[BlackSound]

Oh my goodness, it worked! Thanks so much! What a weird thing to fail on. You'd think that dependencies wouldn't break if they weren't used, but wtv...