Programming Issues

Issues

SimpleAsyncUncaughtExceptionHandler : Unexpected exception occurred invoking async method:

Spring boot Exception SimpleAsyncUncaughtExceptionHandler : Unexpected exception occurred invoking async method: is thrown if an exception is thrown from the @Async annotation method. This error is due to either to a coding problem or to a logical issue. If the error has been corrected, this exception SimpleAsyncUncaughtExceptionHandler : Unexpected exception

Cannot load driver class: com.mysql.jdbc.Driver

The database exception Cannot load driver class: com.mysql.jdbc.Driver occurs if there is a disparity between mysql driver class, mysql driver jar version and mysql database version. The java application attempts to load a driver class from the mysql database driver jar. If the driver class is unable to load, the

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The spring boot exception com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure happens when the java mysql database driver is unable to connect to mysql database. The Java application was unable to establish communication between mysql database driver and mysql database. The Jdbc connection between the java and mysql database could not be established.

java.lang.IllegalStateException: Ambiguous mapping. Cannot map method

The spring boot exception IllegalStateException: Ambiguous mapping. Cannot map method occurs when two methods in the rest controller class are configured with the same request mapping url. Two methods in the rest controller class should not be configured using the same url. The exception will be shown as BeanCreationException: Error

NoSuchBeanDefinitionException: No bean named available

The spring boot exception org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named available and org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named is defined happens when you try to access a bean that is not available or is not defined in the spring boot context. If the bean is not available when injecting the spring boot bean programmatically

NoSuchBeanDefinitionException: No qualifying bean of type

The spring boot exception org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type available and org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type defined occurs when the bean is not available or defined while auto-wired in another class. If the bean is not available when the spring boot bean is annotated by @Autowired from the

AnnotationConfigApplicationContext has not been refreshed yet

In the spring boot web application development, you may need to use Application Context to handle loaded beans.The Application context contains all the references to the loaded beans. Spring boot provides a handle for the context of the application. If you use the application context, you may encounter an error

JsonbException: Can’t deserialize JSON array into: class

The javax.json.bind.JsonbException: Can’t deserialize JSON array into: class exception occurs when you try to convert json string data to a java object. If the json string contains an array of objects and attempts to deserialize the json string to a json object, the array of objects could not be assigned

JsonbException: Cannot create instance of a class: class, No default constructor found.

The javax.json.bind.JsonbException: Cannot create instance of a class: class, No default constructor found. exception occurs when no default constructor is found in the java bean class. The spring boot default implementation for json binding api is org.eclipse.yasson. If no default constructor is found, the yasson code will throw this exception

can not access a member of class with modifiers “private”

The ReflectionUtils can not access a member of class with modifiers “private” exception occurs when the default constructor or method is configured as private in the java bean class. If the class method or properties are configured as private, the java reflection can not access the member of class with

JSON Binding provider org.eclipse.yasson.JsonBindingProvider not found

The javax.json.bind.JsonbException: JSON Binding provider org.eclipse.yasson.JsonBindingProvider not found exception occurs when the java.json.bind maven dependency is added and JSON bind implementation dependency is not added in the spring boot maven. As the implemented class is not available in the class path, the exception java.lang.ClassNotFoundException: org.eclipse.yasson.JsonBindingProvider will be thrown. The exception

JndiDataSourceAutoConfiguration not loaded because did not find property

Auto configurations are one of the best features at spring boot. Spring boot supports auto-configured datasource. The credentials for the database are included in application.properties. Spring boot builds a datasource object dynamically from the configurations. If an error occurs in the initialization phase of the datasource, the error will be

BCryptPasswordEncoder Bad strength Spring Boot Security

In the spring boot security application, The error message “Exception in thread “main” java.lang.IllegalArgumentException: Bad strength” is seen when the application starts. The BCryptPasswordEncoder is throwing this exception as it cannot create and initialize the object. Here, we will see about this exception in this post. The spring boot security

BCryptPasswordEncoder – Empty encoded password Spring Boot Security

In spring boot security application, this error message “o.s.s.c.bcrypt.BCryptPasswordEncoder : Empty encoded password” is seen often. The user is not allowed to login to the application by security authentication failure. In this post, we will see about this warning message If users of the application attempt to login with a

Encoded password does not look like BCrypt Spring Boot Security

We’ll see a warning message “o.s.s.c.bcrypt.BCryptPasswordEncoder : Encoded password does not look like BCrypt” in the spring boot console logs. We’ll see a pattern that the user has not been able to access whatever the password entered. We’re going to see this warning message in the post. If users of