I wonder if anyone else finds this stack trace familiar. As often is
the case with non-mainstream languages, Google turns up nothing of
value. The code fragment goes below. If I comment out the code inside
the finally statement, everything compiles fine. If I keep it, I get
the stack trace below. I have tried to create a minimal repro, but did
not have any success. I understand this is not a Lift issue, but this
group has a sizable chunk of Scala enthusiasts, so hopefully someone
has encountered something like this
block #9 :
CONSTANT (Constant(null))
LOAD_LOCAL variable t
DUP
STORE_LOCAL variable eqEqTemp$2
CZJUMP (REFERENCE(java.lang.Object))EQ ? 13 : 15
Successors: 3 15 13 3
trying to emit: DROP REFERENCE(scala.Null)
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.scala_tools.maven.executions.MainHelper.runMain
(MainHelper.java:151)
at org.scala_tools.maven.executions.MainWithArgsInFile.main
(MainWithArgsInFile.java:26)
Caused by: java.lang.AssertionError: assertion failed: BasicBlock
closed
at scala.Predef$.assert(Predef.scala:92)
at scala.tools.nsc.backend.icode.BasicBlocks$BasicBlock.emit
(BasicBlocks.scala:327)
at scala.tools.nsc.backend.icode.BasicBlocks$BasicBlock.emit
(BasicBlocks.scala:317)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.adapt
(GenICode.scala:1006)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala
$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:
496)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala
$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:
447)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala
$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:
183)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun
$genStat$1.apply(GenICode.scala:146)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun
$genStat$1.apply(GenICode.scala:145)
etc, etc...
The code fragment:
def findTagWithName(tags: List[Tag], name: String) : Tag = {
val t = tags.find(x => x.name == name)
return t.getOrElse(null)
}
def getCookieValue(name: String, default: String) : String = {
for(cookie <- S.findCookie(name); v <- cookie.value) {
return v
}
return default
}
def getParamValue(name: String, default: String) : String = {
for(v <- S.param(name)) {
return v
}
return default
}
def getSelectedTag(tags: List[Tag], cookieName: String, urlParam:
String) : Tag = {
var t : Tag = null
try {
if(tags.length == 0) {
return null
}
// See if tag name is present in the URL
val tagName = getParamValue(urlParam, "")
// If yes, check if a tag with this name is present in
tags
t = findTagWithName(tags, tagName)
// If it is, write out the right cookie and return
if(t != null) {
return t
}
// if no, check the corresponding cookie
val cv = getCookieValue(cookieName, "")
if(cv != null) {
// and check if the tag with a name stored in cookie
is present in tags
t = findTagWithName(tags, cv)
if(t != null) {
return t
}
}
// otherwise just select the last tag from the list and
write out the cookie
t = tags.last
return t
} finally {
if(t != null) {
var c = HTTPCookie(cookieName, t.name).setMaxAge(365 *
24 * 60 * 60)
S.addCookie(c)
}
}
}
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