java.lang.RuntimeException: Unknown token 2: <: 

Warning:  session_start(): open(/var/lib/php/sessions/sess_6vp5do62m8t5082bttd1372i3l, O_RDWR) failed: No space left on device (28) in /var/www/tb-usercake/models/config.php on line 51



Warning:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in /var/www/tb-usercake/models/config.php on line 51

{"1000658":"print function (=System.out.println + logging in memory)","1002936":"assertEqualsVerbose","1008946":"sfu - synonym of structureForUser - structure() without too many back refs","1014027":"mechList - we switched from tlftj to tlft","1014221":"listToWordTree"}
	at main.fail(m1008705.java:1589)
	at main$jsonDecode_Y.fail_base(m1008705.java:14008)
	at main$jsonDecode_Y.fail(m1008705.java:14006)
	at main$jsonDecode_Y.parseExpr(m1008705.java:14058)
	at main$jsonDecode_Y.parse(m1008705.java:14012)
	at main.jsonDecode(m1008705.java:13990)
	at main.jsonDecodeMap(m1008705.java:12844)
	at main.getSnippetTitles(m1008705.java:10820)
	at main$JavaXHyperlinker.codeToHTML(m1008705.java:6209)
	at main.html2(m1008705.java:85)
	at main.html(m1008705.java:67)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:577)
	at main.invokeMethod(m1008705.java:1601)
	at main.callOpt_withVarargs(m1008705.java:4387)
	at main.callOpt(m1008705.java:3326)
	at main.callHtmlMethod2(m1008705.java:11404)
	at main$MyHTTPD$1.get(m1008705.java:7337)
	at main$MyHTTPD$1.get(m1008705.java:1)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:577)
	at main.invokeMethod(m1008705.java:1601)
	at main.safeCallF(m1008705.java:642)
	at main.callF(m1008705.java:611)
	at main$MyHTTPD.serve(m1008705.java:7373)
	at main$NanoHTTPD.serve_2(m1008705.java:9572)
	at main$NanoHTTPD.serve(m1008705.java:9553)
	at main$NanoHTTPD$HTTPSession.execute(m1008705.java:8453)
	at main$NanoHTTPD$ClientHandler.run(m1008705.java:7829)
	at java.base/java.lang.Thread.run(Thread.java:833)

I think a word tree is a Map<S, O> where the values are more word trees or any kind of non-Map (=leaf).

The keys are words or "<default>" to mix a leaf and a non-leaf.