Scala Programming Language
  1. Scala Programming Language
  2. SI-7324

scalac creates invalid class files, results in a java.lang.ClassFormatError at class-load time

    Details

      Description

      The scala compiler happily generates class files with more than 254 method arguments, which will cause a java.lang.ClassFormatError as soon as a JVM loads the class file:

      object Foo extends App {
      def foo(
      _1: Int, _2: Int, _3: Int, _4: Int, _5: Int, _6: Int, _7: Int, _8: Int, _9: Int, _10: Int,
      _11: Int, _12: Int, _13: Int, _14: Int, _15: Int, _16: Int, _17: Int, _18: Int, _19: Int, _20: Int,
      _21: Int, _22: Int, _23: Int, _24: Int, _25: Int, _26: Int, _27: Int, _28: Int, _29: Int, _30: Int,
      _31: Int, _32: Int, _33: Int, _34: Int, _35: Int, _36: Int, _37: Int, _38: Int, _39: Int, _40: Int,
      _41: Int, _42: Int, _43: Int, _44: Int, _45: Int, _46: Int, _47: Int, _48: Int, _49: Int, _50: Int,
      _51: Int, _52: Int, _53: Int, _54: Int, _55: Int, _56: Int, _57: Int, _58: Int, _59: Int, _60: Int,
      _61: Int, _62: Int, _63: Int, _64: Int, _65: Int, _66: Int, _67: Int, _68: Int, _69: Int, _70: Int,
      _71: Int, _72: Int, _73: Int, _74: Int, _75: Int, _76: Int, _77: Int, _78: Int, _79: Int, _80: Int,
      _81: Int, _82: Int, _83: Int, _84: Int, _85: Int, _86: Int, _87: Int, _88: Int, _89: Int, _90: Int,
      _91: Int, _92: Int, _93: Int, _94: Int, _95: Int, _96: Int, _97: Int, _98: Int, _99: Int, _100: Int,
      _101: Int, _102: Int, _103: Int, _104: Int, _105: Int, _106: Int, _107: Int, _108: Int, _109: Int, _110: Int,
      _111: Int, _112: Int, _113: Int, _114: Int, _115: Int, _116: Int, _117: Int, _118: Int, _119: Int, _120: Int,
      _121: Int, _122: Int, _123: Int, _124: Int, _125: Int, _126: Int, _127: Int, _128: Int, _129: Int, _130: Int,
      _131: Int, _132: Int, _133: Int, _134: Int, _135: Int, _136: Int, _137: Int, _138: Int, _139: Int, _140: Int,
      _141: Int, _142: Int, _143: Int, _144: Int, _145: Int, _146: Int, _147: Int, _148: Int, _149: Int, _150: Int,
      _151: Int, _152: Int, _153: Int, _154: Int, _155: Int, _156: Int, _157: Int, _158: Int, _159: Int, _160: Int,
      _161: Int, _162: Int, _163: Int, _164: Int, _165: Int, _166: Int, _167: Int, _168: Int, _169: Int, _170: Int,
      _171: Int, _172: Int, _173: Int, _174: Int, _175: Int, _176: Int, _177: Int, _178: Int, _179: Int, _180: Int,
      _181: Int, _182: Int, _183: Int, _184: Int, _185: Int, _186: Int, _187: Int, _188: Int, _189: Int, _190: Int,
      _191: Int, _192: Int, _193: Int, _194: Int, _195: Int, _196: Int, _197: Int, _198: Int, _199: Int, _200: Int,
      _201: Int, _202: Int, _203: Int, _204: Int, _205: Int, _206: Int, _207: Int, _208: Int, _209: Int, _210: Int,
      _211: Int, _212: Int, _213: Int, _214: Int, _215: Int, _216: Int, _217: Int, _218: Int, _219: Int, _220: Int,
      _221: Int, _222: Int, _223: Int, _224: Int, _225: Int, _226: Int, _227: Int, _228: Int, _229: Int, _230: Int,
      _231: Int, _232: Int, _233: Int, _234: Int, _235: Int, _236: Int, _237: Int, _238: Int, _239: Int, _240: Int,
      _241: Int, _242: Int, _243: Int, _244: Int, _245: Int, _246: Int, _247: Int, _248: Int, _249: Int, _250: Int,
      _251: Int, _252: Int, _253: Int, _254: Int, _255: Int
      ) = ???
      }
      
      java.lang.ClassFormatError: Too many arguments in method signature in class file Foo$
      	at java.lang.ClassLoader.defineClass1(Native Method)
      	at java.lang.ClassLoader.defineClass(ClassLoader.java:787)
      	at scala.tools.nsc.util.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:87)
      	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
      	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
      	at java.lang.Class.getDeclaredMethods0(Native Method)
      	at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
      	at java.lang.Class.privateGetPublicMethods(Class.java:2571)
      	at java.lang.Class.getMethods(Class.java:1429)
      
      object Bar extends App
      class Bar(
      _1: Int, _2: Int, _3: Int, _4: Int, _5: Int, _6: Int, _7: Int, _8: Int, _9: Int, _10: Int,
      _11: Int, _12: Int, _13: Int, _14: Int, _15: Int, _16: Int, _17: Int, _18: Int, _19: Int, _20: Int,
      _21: Int, _22: Int, _23: Int, _24: Int, _25: Int, _26: Int, _27: Int, _28: Int, _29: Int, _30: Int,
      _31: Int, _32: Int, _33: Int, _34: Int, _35: Int, _36: Int, _37: Int, _38: Int, _39: Int, _40: Int,
      _41: Int, _42: Int, _43: Int, _44: Int, _45: Int, _46: Int, _47: Int, _48: Int, _49: Int, _50: Int,
      _51: Int, _52: Int, _53: Int, _54: Int, _55: Int, _56: Int, _57: Int, _58: Int, _59: Int, _60: Int,
      _61: Int, _62: Int, _63: Int, _64: Int, _65: Int, _66: Int, _67: Int, _68: Int, _69: Int, _70: Int,
      _71: Int, _72: Int, _73: Int, _74: Int, _75: Int, _76: Int, _77: Int, _78: Int, _79: Int, _80: Int,
      _81: Int, _82: Int, _83: Int, _84: Int, _85: Int, _86: Int, _87: Int, _88: Int, _89: Int, _90: Int,
      _91: Int, _92: Int, _93: Int, _94: Int, _95: Int, _96: Int, _97: Int, _98: Int, _99: Int, _100: Int,
      _101: Int, _102: Int, _103: Int, _104: Int, _105: Int, _106: Int, _107: Int, _108: Int, _109: Int, _110: Int,
      _111: Int, _112: Int, _113: Int, _114: Int, _115: Int, _116: Int, _117: Int, _118: Int, _119: Int, _120: Int,
      _121: Int, _122: Int, _123: Int, _124: Int, _125: Int, _126: Int, _127: Int, _128: Int, _129: Int, _130: Int,
      _131: Int, _132: Int, _133: Int, _134: Int, _135: Int, _136: Int, _137: Int, _138: Int, _139: Int, _140: Int,
      _141: Int, _142: Int, _143: Int, _144: Int, _145: Int, _146: Int, _147: Int, _148: Int, _149: Int, _150: Int,
      _151: Int, _152: Int, _153: Int, _154: Int, _155: Int, _156: Int, _157: Int, _158: Int, _159: Int, _160: Int,
      _161: Int, _162: Int, _163: Int, _164: Int, _165: Int, _166: Int, _167: Int, _168: Int, _169: Int, _170: Int,
      _171: Int, _172: Int, _173: Int, _174: Int, _175: Int, _176: Int, _177: Int, _178: Int, _179: Int, _180: Int,
      _181: Int, _182: Int, _183: Int, _184: Int, _185: Int, _186: Int, _187: Int, _188: Int, _189: Int, _190: Int,
      _191: Int, _192: Int, _193: Int, _194: Int, _195: Int, _196: Int, _197: Int, _198: Int, _199: Int, _200: Int,
      _201: Int, _202: Int, _203: Int, _204: Int, _205: Int, _206: Int, _207: Int, _208: Int, _209: Int, _210: Int,
      _211: Int, _212: Int, _213: Int, _214: Int, _215: Int, _216: Int, _217: Int, _218: Int, _219: Int, _220: Int,
      _221: Int, _222: Int, _223: Int, _224: Int, _225: Int, _226: Int, _227: Int, _228: Int, _229: Int, _230: Int,
      _231: Int, _232: Int, _233: Int, _234: Int, _235: Int, _236: Int, _237: Int, _238: Int, _239: Int, _240: Int,
      _241: Int, _242: Int, _243: Int, _244: Int, _245: Int, _246: Int, _247: Int, _248: Int, _249: Int, _250: Int,
      _251: Int, _252: Int, _253: Int, _254: Int, _255: Int
      )
      
      java.lang.ClassFormatError: Too many arguments in method signature in class file Bar
      	at java.lang.ClassLoader.defineClass1(Native Method)
      	at java.lang.ClassLoader.defineClass(ClassLoader.java:787)
      	at scala.tools.nsc.util.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:87)
      	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
      	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
      

      Both examples should be rejected by the compiler.

        Issue Links

          Activity

          Show
          Paul Phillips added a comment - https://github.com/scala/scala/pull/2426

            People

            • Assignee:
              Paul Phillips
              Reporter:
              Simon Ochsenreither
            • Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development