spring boot distributed transaction error java.lang.ClassNotFoundException: javax.transaction.TransactionManager - spring-boot

Question

I am trying to do distributed transaction but I have a lot of errors, so I have written this demo app to explain my problem
my pom.xml has these dependencies :
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>ch.maxant</groupId>
<artifactId>genericconnector-atomikos-api</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.4</version>
</dependency>
</dependencies>
and my only class containing main function is :
#Configuration
public class Main {
#Autowired
#Qualifier("xaTransactionManager")
protected static UserTransactionManager tm;
#Primary
#Bean(name = "xaTransactionManager", initMethod = "init", destroyMethod = "close")
public UserTransactionManager xaTransactionManager() throws SystemException {
UserTransactionManager txManager = new UserTransactionManager();
txManager.setTransactionTimeout(300);
txManager.setForceShutdown(false);
return txManager;
}
#Bean(name = "xaTransactionService", initMethod = "init", destroyMethod = "shutdownWait")
public UserTransactionServiceImp xaTransactionService() {
return new UserTransactionServiceImp();
}
public static void main(String[] s) {
try {
tm.begin();
// here is empty
tm.commit();
} catch (Exception e) {
tm.rollback();
System.out.println(e.getMessage());
}
}
}
I have just begin a transaction
but I have faced this problem at the Line of tm.begin()
java.lang.NoClassDefFoundError: javax/transaction/TransactionManager
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: javax.transaction.TransactionManager
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 19 more
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" [INFO] NETBEANS-ExecEvent:{"exc":{"msg":"Q29tbWFuZCBleGVjdXRpb24gZmFpbGVkLg=="},"mojo":{"impl":"org.codehaus.mojo.exec.ExecMojo","urls":["file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/codehaus\/mojo\/exec-maven-plugin\/1.2.1\/exec-maven-plugin-1.2.1.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/apache\/maven\/reporting\/maven-reporting-api\/2.0.6\/maven-reporting-api-2.0.6.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/apache\/maven\/doxia\/doxia-sink-api\/1.0-alpha-7\/doxia-sink-api-1.0-alpha-7.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/commons-cli\/commons-cli\/1.0\/commons-cli-1.0.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/codehaus\/plexus\/plexus-interactivity-api\/1.0-alpha-4\/plexus-interactivity-api-1.0-alpha-4.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/codehaus\/plexus\/plexus-utils\/2.0.5\/plexus-utils-2.0.5.jar","file:\/C:\/Users\/NOSIRAT\/.m2\/repository\/org\/apache\/commons\/commons-exec\/1.1\/commons-exec-1.1.jar"],"goal":"exec","id":"org.codehaus.mojo:exec-maven-plugin:1.2.1","source":"CLI","execId":"default-cli"},"type":"MojoFailed"}
any help please?

Answer 1

The javax.transaction.TransactionManager is a class inside the J2EE SDK library javaee.jar, and probably you are missing this jar file in your project's classpath.
You can follow this article to add the needed dependency to your project!
For the impatient, here is the dependency that needs to be added to your pom.xml
<repository>
<id>Java.Net</id>
<url>http://download.java.net/maven/2/</url>
</repository>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>6.0</version>
</dependency>
Hope this helps!