https://issues.apache.org/bugzilla/show_bug.cgi?id=54475
Bug ID: 54475
Summary: SMAP broken in Java 8 for JSP compile
Product: Tomcat 8
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P2
Component: Jasper
Assignee: dev@tomcat.apache.org
Reporter: nicho...@nicholaswilliams.net
Classification: Unclassified
In order to compile JSPs with Java 8, I made the following additions to the JSP
servlet in conf\web.xml:
<init-param>
<param-name>compiler</param-name>
<param-value>modern</param-value>
</init-param>
<init-param>
<param-name>compilerSourceVM</param-name>
<param-value>1.8</param-value>
</init-param>
<init-param>
<param-name>compilerTargetVM</param-name>
<param-value>1.8</param-value>
</init-param>
However, I get the following error:
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to
compile class for JSP
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:378)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
...
Caused by java.io.IOException: unexpected tag: 18
at
org.apache.jasper.compiler.SmapUtil$SDEInstaller.copyConstantPool(SmapUtil.java:434)
at
org.apache.jasper.compiler.SmapUtil$SDEInstaller.addSDE(SmapUtil.java:251)
at
org.apache.jasper.compiler.SmapUtil$SDEInstaller.install(SmapUtil.java:223)
at
org.apache.jasper.compiler.SmapUtil$SDEInstaller.install(SmapUtil.java:200)
at org.apache.jasper.compiler.SmapUtil.installSmap(SmapUtil.java:163)
at
org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:284)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
...
If I also add the suppressSmap parameter to the JSP servlet in conf\web.xml,
the error goes away, and the JSP compiles fine:
<init-param>
<param-name>suppressSmap</param-name>
<param-value>true</param-value>
</init-param>
Something about the SMAP is not playing well with Java 8 language features like
the lambda expression.
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