Application classloaders leaked by com.sun.el.parser.ELParser$LookaheadSuccess

Issue

• We're experiencing a metaspace leak across application redeployments. A heap dump shows classloaders persisted by references from com.sun.el.parser.ELParser$LookaheadSuccess static backtrace field:

Class Name                                                                                                                | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap
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[17] class com.sun.el.parser.ELParser @ 0xb18aae88                                                                        |            3 |           16 |               264 |         2,448
'- jj_ls com.sun.el.parser.ELParser$LookaheadSuccess @ 0xb18aaf00                                                         |            3 |           32 |               264 |         1,984
   '- backtrace java.lang.Object[5] @ 0xb18aaf20                                                                          |            3 |           40 |               264 |         1,952
      '- [4] java.lang.Object[5] @ 0xb18aaf48                                                                             |            3 |           40 |               264 |         1,464
         '- [2] java.lang.Object[32] @ 0xb18ab390                                                                         |            3 |          144 |               264 |           144
            '- [15] class org.primefaces.webapp.filter.FileUploadFilter @ 0xb00a0078                                      |            3 |           16 |               264 |            80