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https://issues.apache.org/jira/browse/SLING-6458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821692#comment-15821692
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Felix Meschberger commented on SLING-6458:
------------------------------------------
Thanks [~cziegeler]. In this case I stand corrected and it really is about
topic (1): Update Jasper.
> JSP scripting does not support Java 8 features (lambdas, method references,
> etc)
> --------------------------------------------------------------------------------
>
> Key: SLING-6458
> URL: https://issues.apache.org/jira/browse/SLING-6458
> Project: Sling
> Issue Type: Bug
> Components: Scripting
> Affects Versions: Scripting JSP 2.0.28, Scripting JSP 2.1.0, Scripting JSP
> 2.1.4, Scripting JSP 2.1.6, Scripting JSP 2.1.8, Scripting JSP 2.2.0,
> Scripting JSP 2.2.2, Scripting JSP 2.2.4, Scripting JSP 2.2.6
> Reporter: Henry Kuijpers
>
> When trying to use Java 8 functionality in a JSP file, the Jasper framework
> in the Sling Scripting bundle fails to compile the JSP file. It seems to get
> stuck on a Java 8 feature: Lambdas.
> {code}
> <%@page session="false" %>
> <%@ page import="java.util.stream.IntStream" %>
> <%@ page import="java.io.IOException" %>
> <%
> out.println("Lambda test");
> IntStream leip = IntStream.of(1, 2, 3, 4, 5, 6);
> final JspWriter out2 = out;
> leip.forEach(x -> {
> try {
> out2.println(x);
> } catch (IOException e) {
> // Intentionally do nothing
> }
> });
> %>
> {code}
> When we remove the complete "leip.forEach" statement, the code compiles and
> executes successfully.
> Upon further investigation, I found out that the Jasper compiler that is
> being used, does not have support for "tag 18", which seems to be the lambda
> feature in Java 8.
> I could find the constant pool tags over here:
> https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4-140
> Clearly, there is no support for MethodHandle, MethodType, InvokeDynamic.
> I could find a bug report for Tomcat (where Jasper is developed) over here:
> https://bz.apache.org/bugzilla/show_bug.cgi?id=54475
> It seems that the issue was fixed in a newer version of Jasper, namely
> 6.0.40. We are currently using 6.0.14 (which is in Apache Sling Scripting JSP
> version bundle version 2.1.4).
> I tried looking at
> https://mvnrepository.com/artifact/org.apache.sling/org.apache.sling.scripting.jsp
> but for some reason all newer versions are also embedding Jasper 6.0.14
> (which does not support Java 8) and in the custom code inside that bundle I
> also do not see any cases for 18 in the switch statement in
> SmapUtil$SDEInstaller.copyConstantPool. Nor do I see any traces that look
> like this fix:
> https://bz.apache.org/bugzilla/attachment.cgi?id=31416&action=diff
> See below a stacktrace of what's happening:
> {code}
> 12.01.2017 14:39:19.063 *ERROR* [144.119.190.210 [1484228359038] POST
> /content/page/sign-up.html HTTP/1.1]
> org.apache.sling.servlets.get.impl.DefaultGetServlet No renderer for
> extension html, cannot render resource ResourceWrapper,
> type=test/components/form/actions/register,
> path=/content/page/sign-up/jcr:content/par/start, resource=[JcrNodeResource,
> type=foundation/components/form/start, superType=null,
> path=/content/page/sign-up/jcr:content/par/start]
> 12.01.2017 14:39:19.079 *ERROR* [144.119.190.210 [1484228359038] POST
> /content/page/sign-up.html HTTP/1.1] com.day.cq.wcm.tags.IncludeTag Error
> while executing script
> /apps/test/components/form/actions/register/post.POST.jsp
> org.apache.sling.api.scripting.ScriptEvaluationException:
> org.apache.sling.scripting.jsp.jasper.JasperException: Unable to compile
> class for JSP
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:388)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.eval(DefaultSlingScript.java:171)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:463)
> at com.day.cq.wcm.tags.IncludeTag.includeScript(IncludeTag.java:167)
> at com.day.cq.wcm.tags.IncludeTag.doEndTag(IncludeTag.java:87)
> at
> org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:281)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:102)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory$JspScriptEngine.eval(JspScriptEngineFactory.java:524)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:361)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.eval(DefaultSlingScript.java:171)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:463)
> at
> org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:508)
> at
> org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:45)
> ... filters ommitted for brevity ...
> at
> com.day.j2ee.servletengine.RequestDispatcherImpl.doFilter(RequestDispatcherImpl.java:321)
> at
> com.day.j2ee.servletengine.RequestDispatcherImpl.service(RequestDispatcherImpl.java:340)
> at
> com.day.j2ee.servletengine.RequestDispatcherImpl.service(RequestDispatcherImpl.java:383)
> at
> com.day.j2ee.servletengine.ServletHandlerImpl.process(ServletHandlerImpl.java:335)
> at
> com.day.j2ee.servletengine.HttpListener$Worker.run(HttpListener.java:644)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.sling.api.SlingException:
> org.apache.sling.scripting.jsp.jasper.JasperException: Unable to compile
> class for JSP
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.handleJspExceptionInternal(JspServletWrapper.java:691)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:608)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:525)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:281)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:102)
> at
> org.apache.sling.scripting.jsp.JspScriptEngineFactory$JspScriptEngine.eval(JspScriptEngineFactory.java:524)
> at
> org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:361)
> ... 121 more
> Caused by: java.io.IOException: unexpected tag: 18
> at
> org.apache.sling.scripting.jsp.jasper.compiler.SmapUtil$SDEInstaller.copyConstantPool(SmapUtil.java:491)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.SmapUtil$SDEInstaller.addSDE(SmapUtil.java:308)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.SmapUtil$SDEInstaller.<init>(SmapUtil.java:264)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.SmapUtil$SDEInstaller.install(SmapUtil.java:243)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.SmapUtil.installSmap(SmapUtil.java:167)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:151)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.Compiler.compile(Compiler.java:312)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.Compiler.compile(Compiler.java:290)
> at
> org.apache.sling.scripting.jsp.jasper.compiler.Compiler.compile(Compiler.java:277)
> at
> org.apache.sling.scripting.jsp.jasper.JspCompilationContext.compile(JspCompilationContext.java:501)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.prepareServlet(JspServletWrapper.java:427)
> at
> org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:486)
> ... 126 more
> {code}
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