小编D. *_*Doe的帖子

我正在尝试获取 JSP 中单选按钮的值。但我收到了这个错误。当单选按钮值为“All”时，代码运行良好，但当它是另一个值时，问题就会出现。我打印了该属性并仍然获得了价值。我想不通我错在哪里。

错误

    ERROR c.p.f.e.GlobalExceptionHandler - [URL] : http://localhost:8080/project/motsach/genre
org.springframework.dao.InvalidDataAccessApiUsageException: No value supplied for the SQL parameter 'theloai': This SqlParameterSource is empty
        at org.springframework.jdbc.core.namedparam.NamedParameterUtils.buildValueArray(NamedParameterUtils.java:342) ~[spring-jdbc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.getPreparedStatementCreator(NamedParameterJdbcTemplate.java:348) ~[spring-jdbc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:192) ~[spring-jdbc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:204) ~[spring-jdbc-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at com.project.form.dao.BookDaoImpl.findBookbyGenre(BookDaoImpl.java:119) ~[classes/:na]
        at com.project.form.service.BookServiceImpl.findBookbyGenre(BookServiceImpl.java:59) ~[classes/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) ~[spring-tx-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.9.RELEASE.jar:4.3.9.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
        at com.sun.proxy.$Proxy111.findBookbyGenre(Unknown …