java.sql.SQLException: Can not issue empty query.

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MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this https://goo.gl/3E2qzg

Solutions on the web

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java.sql.SQLException: Can not issue empty query.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
at com.mysql.jdbc.StatementImpl.checkNullOrEmptyQuery(StatementImpl.java:492)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1367)
at com.you.sql.Student.queryStudent(Student.java:51)
at com.you.sql.Student.main(Student.java:79)

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