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私は、WebLogic Serverバージョン12.1.2.0.0にデプロイされた春のMVCアプリケーションのJSPにこのコードを入れました。私はJSTL-1.2JSP:jstl core java.lang.Byteの条件
2-> [${item.companyLogo}]
3-> [${empty item.companyLogo}]
4-> [${item.companyLogo eq null}]
<c:choose>
<c:when test="${empty item.companyLogo} ">
IS EMPTY
<img src="${contextPath}/images/devices-logo.gif" />
</c:when>
<c:otherwise>
NOT EMPTY
</c:otherwise>
</c:choose>
を使用しても
<c:when test="${empty item.companyLogo == true} ">
しかし、私はこれらを参照してください画面で試したのです:私は${item.companyLogo.length}
と長さをチェックしようとした場合、私は
2-> []
3-> [true]
4-> [true]
NOT EMPTY
をこのエラーが発生しました:
]] Root cause of ServletException.
java.lang.NumberFormatException: For input string: "length"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at javax.el.ArrayELResolver.toInteger(ArrayELResolver.java:378)
at javax.el.ArrayELResolver.getValue(ArrayELResolver.java:198)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:188)
at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
at com.sun.el.parser.AstValue.getValue(AstValue.java:183)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
at weblogic.servlet.jsp.ELHelper.evaluate(ELHelper.java:32)
at jsp_servlet._web_45_inf._jsp._result.__productcategoryresult._jspService(__productcategoryresult.java:330)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:341)
at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:478)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:367)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:238)
at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:573)
at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:480)
at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:347)
at org.apache.taglibs.standard.tag.common.core.ImportSupport.doEndTag(ImportSupport.java:204)
at jsp_servlet._web_45_inf._jsp._template.__template._jsp__tag10(__template.java:659)
このプロパティのタイプcompanyLogo
Byte[] companyLogo;