Common Java Errors and How to Fix Them
Browse all documented Java errors with detailed explanations, root causes, and step-by-step fixes.
SQL syntax error or missing database driver exception: Unknown column 'email' in
This error occurs when the Java application is unable to find a column in the database table that matches the one specif…
Cannot find symbol: method get() in class Main
This error occurs when Java compiler cannot find a method, variable, or class, even though it seems to be defined correc…
java.lang.IllegalArgumentException: Bad char in name at java.base/java.lang.Stri
This error occurs when a program attempts to decode a string using a charset that contains invalid or non-ASCII characte…
Failed to autowire. No bean of type 'com.example.service.UserService' available.
This error occurs when the Spring Framework is unable to autowire a bean (a managed object) of the specified type. This …
java: cannot find symbol variable 'user' in method 'main' at line 10
This error occurs when the compiler cannot find the definition of a variable, method, or class that is being used in the…
Error executing SQL query: Cannot insert explicit value for identity column in t
This error occurs when you're trying to insert a value into an auto-incrementing primary key column in a database, but t…
ORA-12545: TNS:Cannot register with TSLS (TNS Listener Service)
This error occurs when the Oracle JDBC driver is unable to establish a connection with the TNS Listener Service due to a…
Cannot find symbol: method drawString(String, int, int) in class javax.swing.JPa
This error occurs when the Java compiler cannot find a method or variable that you are trying to use in your code. This …
java.util.concurrent.CancellationException: Programmatic interruption of task 'T
This error occurs when a task is interrupted or cancelled before it has a chance to complete, typically due to a call to…
Method call expected, but ';' found at line 15 column 14 in the method 'main'
This error occurs when the Java compiler encounters an unexpected symbol or keyword in the code.…
Error creating bean with name 'userService': Injection of autowired dependencies
This error occurs when the Spring Framework is unable to create a bean due to a dependency injection issue. It often hap…
org.springframework.beans.factory.BeanCreationException: Error creating bean wit
This error occurs when the Spring Framework is unable to create a bean (an object managed by the Spring IoC container) d…
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