Common Java Errors and How to Fix Them
Browse all documented Java errors with detailed explanations, root causes, and step-by-step fixes.
Cannot find symbol: method 'get' on class 'Scanner'
This error occurs when the Java compiler cannot find a method or variable that is being used in the code. In this case, …
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.…
java.sql.SQLException: Column 'username' is either not in any table in the FROM
This error occurs when the database connection is unable to execute a SQL query due to an invalid or incorrect query syn…
Syntax error on token "return", { expected after this token
This error occurs when Java encounters syntax that does not conform to the language's rules. In this case, Java is expec…
Method call expected for statement; got if statement
This error occurs when the Java compiler expects a method call after a statement, but instead finds an 'if' statement.…
Syntax error on token 'void', delete this token
This error occurs when the Java compiler encounters a token it does not expect, such as a keyword in the wrong context. …
ORA-00913: too many values in TO_DATE function
This error occurs when the TO_DATE function is used to convert a string to a date in Oracle databases, but the string ha…
The Bean validation provider Spring Boot is unable to inject the @Valid annotati
This error occurs when Spring Boot's auto-configuration feature is not properly enabled in the application, typically du…
Method call expected here for 'continue' statement. Use 'continue' with a label
The 'continue' statement in Java is used to skip the current iteration and move to the next one in a loop. However, if i…
Cannot find symbol: variable 'username' on line 17
This error occurs when Java cannot find the declaration of a variable, method, or class. It is often caused by a typo or…
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…
Cannot find symbol. Symbol: method 'toString()' variable 'student' is defined in
This error occurs when the Java compiler is unable to find a method, class, or variable that is being referenced in the …
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