求助

Question

at java.lang.Thread.run(Thread.java:595)
2011-11-25 12:47:48,421 [http-8080-Processor22] ERROR [500.jsp] - /WEB-INF/content/business/todo-query.jsp(59,24) "${ =='-1'?'selected':'' }" contains invalid expression(s): javax.servlet.jsp.el.ELException: Encountered "==", expected one of [<INTEGER_LITERAL>, <FLOATING_POINT_LITERAL>, <STRING_LITERAL>, "true", "false", "null", "(", "-", "not", "!", "empty", <IDENTIFIER>]
org.apache.jasper.JasperException: /WEB-INF/content/business/todo-query.jsp(59,24) "${ =='-1'?'selected':'' }" contains invalid expression(s): javax.servlet.jsp.el.ELException: Encountered "==", expected one of [<INTEGER_LITERAL>, <FLOATING_POINT_LITERAL>, <STRING_LITERAL>, "true", "false", "null", "(", "-", "not", "!", "empty", <IDENTIFIER>]
程序爆错，好像是el表达式不能用

Answer 1

我在jsp里使用el表达式的时候就出现以上问题。我不知道该怎么表达