org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [SELECT JOB_INSTANCE_ID, JOB_NAME from BATCH_JOB_INSTANCE where JOB_NAME = ? and JOB_KEY = ?]; nested exception is org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "BATCH_JOB_INSTANCE" not found; SQL statement: SELECT JOB_INSTANCE_ID,…

java.sql.SQLSyntaxErrorException: Table ‘dbname.hibernate_sequence’ doesn’t exist error occurs when the hibernate_sequence table does not exist in the database and auto id generation in hibernate is enabled. Hibernate generates and stores the…

java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName error occurs when Hikari could not locate the database url while creating a datasource using database credentials. When Spring Boot tries to create multiple…

The java error: main method not found in the file, please define the main method as: public static void main(string[] args) occurs if the main method not found in class…

Serialize and Deserialize Enum with JSON-B / Yasson is performed in java using json-b or yasson serialization and deserialization. Java enum is a user defined data type that is serialize…

Converting JSON String to Java Object Array is performed using JSON-B in spring boot application. The conversion JSON String to Object in spring boot is explained in detail in the…

JSON binding api specifies the specifications to convert java object to json string format and converting json string to java objects in spring boot. In spring boot, we see how…

If you are a developer or a database administrator, you might have faced the error “Unable to load authentication plugin ‘caching_sha2_password'” while connecting to a MySQL database. This error occurs…

We often see “Content type expected” error in unit test when testing spring boot MVC application. Spring boot test case makes a call to a web service.The Web service comes…

The Spring Boot MVC Controller returns a different HTTP status code compared to the intended HTTP status code in the Junit test case, then the Spring Boot Framework will throw…

Spring boot application uses inversion of control to load all the dependency classes. Java supports the backward compatibility. If any issue occurred due to compatibility, the exception “java.lang.AbstractMethodError” will be…

JSTL (JSP Standard tag library) supports common java operator functions, structural tasks including conditionals statements, looping structures. It also supports tags for editing XML documents, tags for localization and internationalization,…

The spring boot application failed at startup with the exception java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’. This exception is due to a simple discrepancy between application.properties and the spring boot…

The log “Using generated security password:” appears in the startup of the spring boot application. This log is due to default security configuration. This can be disabled, removed or customized…

The exception “java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id “null”” occurs if the spring boot application is enabled with security feature and password encoder is not configured for…

When a restful web service call is made to a Spring Boot MVC application, It shows error “Whitelabel Error Page – There was an unexpected error (type=Internal Server Error, status=500).”…

Spring Boot security is one of the most requested features in the application. Security controls the user access page on the basis of the configured roles. In this post, we…

The Access denied exception There was an unexpected error (type=Forbidden, status=403). Access Denied is a common exception seen in the browser when you access the url of the spring boot…