@Modifying
@Query("update Computer com set com.enabled=!com.enabled where com.id = ?1")

private Boolean enabled;

public Boolean getEnabled() {
    return enabled;
}

public void setEnabled(Boolean enabled) {
    this.enabled = enabled;
}

Caused by: java.lang.IllegalArgumentException: org.hibernate.QueryException: expecting '=', found 'c' [update com.nicinc.Computer com set com.enabled=!com.enabled where com.id = ?1]

spring.datasource.url=jdbc:h2:mem:testdb;MODE=MySQL;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.show-sql=false
spring.jpa.properties.hibernate.format_sql=true
hibernate.dialect=org.hibernate.dialect.H2Dialect

@Converter(autoApply=true)
public class GlobalBooleanConverter implements AttributeConverter<Boolean, Integer>{
    @Override
    public String convertToDatabaseColumn(Boolean value) {
        if (Boolean.TRUE.equals(value)) {
            return Integer.valueOf(1);
        } else {
            return Integer.valueOf(0);
        }
    }
    @Override
    public Boolean convertToEntityAttribute(String value) {
        return Integer.valueOf(1).equals(value);
    }
}

@Modifying
@Query("update Computer com set com.enabled=((-com.enabled)+1) where com.id = ?1")