book-microservices-v2/chapter05

Learn Microservices with Spring Boot (2nd edition) - Chapter 5

chapter05's Issues

javax.persistence missing in classpath

Hi Moisés, when following chapter 5 I came accross the issue, that

import javax.persistence.*;

did not work (javax.persistence cannot be resolved). I added the following dependency in pom.xml which solved the problem:

           `<dependency>
		<groupId>javax.persistence</groupId>
		<artifactId>javax.persistence-api</artifactId>
		<version>2.2</version>
	</dependency>`

Did I miss something when following the book. I am not aware that it is mentioned at some place to add this dependency.

Thanks and best regards,
Matthias

Changing user id and password for H2 database does not work

I tried to overwrite the default user id and password for the h2 database by providing own credentials. To do so I added to the application.properties file these two lines

spring.datasource.user=myuser spring.datasource.password=pw

Via the h2-console I created that user as well. I can log-on to the database with the new user and its password without any problem.

However, when starting the multiplication service, I am getting this error:

org.h2.jdbc.JdbcSQLInvalidAuthorizationSpecException: Falscher Benutzername oder Passwort Wrong user name or password [28000-214]

How can it be if I can log-on to the console with "myuser" and password = "pw" without any problem?

When removing the two lines from the application.properties file it works again as the defaults apply (no user id, no password).

Thanks for your help,
Matthias

/attempts endpoint does not work after introduction of Repositories

Hi Moisés,

After the introduction of the Repositories for the Users and Attempts, the /attempts endpoint does not work anymore. When calling it like this:

http POST :8080/attempts factorA=58 factorB=92 userAlias=matthias guess=5303

I am getting this response:

{"timestamp"}

There is even no http-code.

I also try it via Postman using this payload:

{
    "factorA":20,
    "factorB":50,
    "userAlias":"matthias",
    "guess":1000
}

Here, I am getting the same response as before and can see that there is an internal server error but without any details.

I double checked against your code in Git Hub, and cannot find a problem.

Before I added the Json Configuration, I got this error message:

could not prepare statement; SQL [select u1_0.id, u1_0.alias from user u1_0 where u1_0.alias=?]

Any idea what I am doing wrong?

Thanks and best regards,
Matthias

Issue with creating the user table name

Hi-
Hibernate ran into an issue while trying to create the User table. It gave an error message that indicated that User was a reerved word. So following hibernate convention I backticked the table name User and then it worked. I was wondering if anybody else had the same issue ?

Issue with ChallengeAttemptRepository interface

Hi Moisés, once I added this code

package microservices.book.multiplication.challenge;

import org.springframework.data.repository.CrudRepository;

import java.util.List;

public interface ChallengeAttemptRepository extends CrudRepository<ChallengeAttempt, Long> {

    /**
     * @return the last 10 attempts for a given user, identified by their alias.
     */
    List<ChallengeAttempt> findTop10ByUserAliasOrderByIdDesc(String userAlias);
}

This is my repository: https://github.com/wagenbm/LearnMicroservices.git

I cannot run the application anymore. This is the console output I get when running the application:

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:3.0.1:run (default-cli) on project multiplication: Process terminated with exit code: 1 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:3.0.1:run (default-cli) on project multiplication: Process terminated with exit code: 1
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:375)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:171)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:163)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:578)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:578)
at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:47)
at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:156)
at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:72)
Caused by: org.apache.maven.plugin.MojoExecutionException: Process terminated with exit code: 1
at org.springframework.boot.maven.JavaProcessExecutor.run (JavaProcessExecutor.java:74)
at org.springframework.boot.maven.RunMojo.run (RunMojo.java:68)
at org.springframework.boot.maven.AbstractRunMojo.run (AbstractRunMojo.java:218)
at org.springframework.boot.maven.AbstractRunMojo.execute (AbstractRunMojo.java:205)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:370)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:171)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:163)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:578)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:578)
at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:47)
at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:156)
at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:72)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

I do not get what exactly the issue with the interface is. When removing the interface, it works again.

Thanks and best regards,
Matthias