Fixes are available
16.0.0.2: WebSphere Application Server Liberty 16.0.0.2
16.0.0.3: WebSphere Application Server Liberty 16.0.0.3
16.0.0.4: WebSphere Application Server Liberty 16.0.0.4
17.0.0.1: WebSphere Application Server Liberty 17.0.0.1
17.0.0.2: WebSphere Application Server Liberty 17.0.0.2
17.0.0.3: WebSphere Application Server Liberty 17.0.0.3
17.0.0.4: WebSphere Application Server Liberty 17.0.0.4
18.0.0.1: WebSphere Application Server Liberty 18.0.0.1
18.0.0.2: WebSphere Application Server Liberty 18.0.0.2
18.0.0.3: WebSphere Application Server Liberty 18.0.0.3
18.0.0.4: WebSphere Application Server Liberty 18.0.0.4
19.0.0.1: WebSphere Application Server Liberty 19.0.0.1
19.0.0.2: WebSphere Application Server Liberty 19.0.0.2
19.0.0.3: WebSphere Application Server Liberty 19.0.0.3
19.0.0.4: WebSphere Application Server Liberty 19.0.0.4
19.0.0.5: WebSphere Application Server Liberty 19.0.0.5
19.0.0.6: WebSphere Application Server Liberty 19.0.0.6
19.0.0.7: WebSphere Application Server Liberty 19.0.0.7
19.0.0.8: WebSphere Application Server Liberty 19.0.0.8
19.0.0.9: WebSphere Application Server Liberty 19.0.0.9
19.0.0.10: WebSphere Application Server Liberty 19.0.0.10
19.0.0.11: WebSphere Application Server Liberty 19.0.0.11
19.0.0.12: WebSphere Application Server Liberty 19.0.0.12
20.0.0.1: WebSphere Application Server Liberty 20.0.0.1
20.0.0.2: WebSphere Application Server Liberty 20.0.0.2
20.0.0.3: WebSphere Application Server Liberty 20.0.0.3
20.0.0.4: WebSphere Application Server Liberty 20.0.0.4
20.0.0.5: WebSphere Application Server Liberty 20.0.0.5
20.0.0.6: WebSphere Application Server Liberty 20.0.0.6
20.0.0.7: WebSphere Application Server Liberty 20.0.0.7
20.0.0.8: WebSphere Application Server Liberty 20.0.0.8
20.0.0.9: WebSphere Application Server Liberty 20.0.0.9
20.0.0.10: WebSphere Application Server Liberty 20.0.0.10
20.0.0.11: WebSphere Application Server Liberty 20.0.0.11
20.0.0.12: WebSphere Application Server Liberty 20.0.0.12
21.0.0.3: WebSphere Application Server Liberty 21.0.0.3
21.0.0.4: WebSphere Application Server Liberty 21.0.0.4
21.0.0.5: WebSphere Application Server Liberty 21.0.0.5
21.0.0.6: WebSphere Application Server Liberty 21.0.0.6
21.0.0.7: WebSphere Application Server Liberty 21.0.0.7
21.0.0.8: WebSphere Application Server Liberty 21.0.0.8
21.0.0.9: WebSphere Application Server Liberty 21.0.0.9
21.0.0.1: WebSphere Application Server Liberty 21.0.0.1
21.0.0.2: WebSphere Application Server Liberty 21.0.0.2
21.0.0.10: WebSphere Application Server Liberty 21.0.0.10
21.0.0.11: WebSphere Application Server Liberty 21.0.0.11
21.0.0.12: WebSphere Application Server Liberty 21.0.0.12
22.0.0.1: WebSphere Application Server Liberty 22.0.0.1
22.0.0.2: WebSphere Application Server Liberty 22.0.0.2
22.0.0.3: WebSphere Application Server Liberty 22.0.0.3
22.0.0.4: WebSphere Application Server Liberty 22.0.0.4
APAR status
Closed as program error.
Error description
Using an EL expression as the value of a tag parameter expecting a primitive type could cause a java.lang.NullPointerException if the value of the expression is null in EL 3.0. The following generates a NPE: <c:if test="${doesNotExist}"> Inside if </c:if> The translated JSP snippet looks like: _jspx_th_c_if_0.setTest(((java.lang.Boolean) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluat e("${doesNotExist}", java.lang.Boolean.class, (PageContext)pageContext, _jspx_fnmap, false)).booleanValue()); Method proprietaryEvaluate in EL 3.0 will return null in this case. To solve this the generated JSP should look like this: _jspx_th_c_if_0.setTest(((java.lang.Boolean) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluat e("${doesNotExist}", boolean.class, (PageContext)pageContext, _jspx_fnmap, false)).booleanValue()); Notice the boolean.class primitive as the second argument of proprietaryEvaluate. In EL 3.0 this returns false when doesNotExist is not set.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM WebSphere Application * * Server Liberty - JavaServer Pages (JSP) * * 2.3 * **************************************************************** * PROBLEM DESCRIPTION: A java.lang.NullPointerException is * * thrown when using Expression Language * * (EL) expressions returning null as the * * value of a tag attribute expecting a * * primitive type * **************************************************************** * RECOMMENDATION: * **************************************************************** When using an EL expression as the value of a tag attribute expecting a primitive type, a java.lang.NullPointerException will be thrown if the EL expression returns null under the EL 3.0 coercion rules. The following example will throw a java.lang.NullPointerException: <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <html> <body> **${unsetVariable}** <c:if test="${unsetVariable}"> Inside if. </c:if> </body> </html>
Problem conclusion
The JSP engine was modified to obtain the correct value of an EL expression of a primitive type, avoiding the java.lang.NullPointerException. The fix for this APAR is currently targeted for inclusion in fix pack 16.0.0.2. Please refer to the Recommended Updates page for delivery information: http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
Temporary fix
Comments
APAR Information
APAR number
PI59436
Reported component name
WAS LIBERTY COR
Reported component ID
5725L2900
Reported release
855
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-03-18
Closed date
2016-04-27
Last modified date
2016-06-13
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WAS LIBERTY COR
Fixed component ID
5725L2900
Applicable component levels
R855 PSY
UP
Document Information
Modified date:
04 May 2022