Program: 130659
Project: 130659
Buggy source:
@Override public boolean generate(World world,Random rand,int x,int y,int z){
  byte b0=3;
  int l=rand.nextInt(2) + 2;
  int i1=rand.nextInt(2) + 2;
  int j1=0, k1, l1, i2;
  for (k1=x - l - 1; k1 <= x + l + 1; ++k1) {
    for (l1=y - 1; l1 <= y + b0 + 1; ++l1) {
      for (i2=z - i1 - 1; i2 <= z + i1 + 1; ++i2) {
        Material material=world.getBlock(k1,l1,i2).getMaterial();
        if (l1 == y - 1 && !material.isSolid())         return false;
        if (l1 == y + b0 + 1 && !material.isSolid())         return false;
        if ((k1 == x - l - 1 || k1 == x + l + 1 || i2 == z - i1 - 1 || i2 == z + i1 + 1) && l1 == y && world.isAirBlock(k1,l1,i2) && world.isAirBlock(k1,l1 + 1,i2))         ++j1;
      }
    }
  }
  if (j1 >= 1 && j1 <= 5) {
    for (k1=x - l - 1; k1 <= x + l + 1; ++k1) {
      for (l1=y + b0; l1 >= y - 1; --l1) {
        for (i2=z - i1 - 1; i2 <= z + i1 + 1; ++i2) {
          if (k1 != x - l - 1 && l1 != y - 1 && i2 != z - i1 - 1 && k1 != x + l + 1 && l1 != y + b0 + 1 && i2 != z + i1 + 1)           world.setBlockToAir(k1,l1,i2);
 else           if (l1 >= 0 && !world.getBlock(k1,l1 - 1,i2).getMaterial().isSolid())           world.setBlockToAir(k1,l1,i2);
 else           if (world.getBlock(k1,l1,i2).getMaterial().isSolid()) {
            if (l1 == y - 1 && rand.nextInt(4) != 0)             world.setBlock(k1,l1,i2,VanillaBlocks.divineMossystone,0,2);
 else             world.setBlock(k1,l1,i2,Blocks.cobblestone,0,2);
          }
        }
      }
    }
    k1=0;
    while (k1 < 2) {
      l1=0;
      while (true) {
        if (l1 < 3) {
          label101: {
            i2=x + rand.nextInt(l * 2 + 1) - l;
            int j2=z + rand.nextInt(i1 * 2 + 1) - i1;
            if (world.isAirBlock(i2,y,j2)) {
              int k2=0;
              if (world.getBlock(i2 - 1,y,j2).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2 + 1,y,j2).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2,y,j2 - 1).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2,y,j2 + 1).getMaterial().isSolid())               ++k2;
              if (k2 == 1) {
                world.setBlock(i2,y,j2,Blocks.chest,0,2);
                TileEntityChest tileentitychest=(TileEntityChest)world.getTileEntity(i2,y,j2);
                if (tileentitychest != null) {
                  WeightedRandomChestContent.generateChestContents(rand,items,tileentitychest,5);
                }
                break label101;
              }
            }
            ++l1;
            continue;
          }
        }
        ++k1;
        break;
      }
    }
    world.setBlock(x,y,z,VanillaBlocks.divineMobSpawner,0,2);
    System.out.println(x + "String_Node_Str" + y+ "String_Node_Str"+ z);
    TileEntityStupidSpawner spawnerTE=(TileEntityStupidSpawner)world.getTileEntity(x,y,z);
    if (spawnerTE != null)     spawnerTE.setEntityName(this.pickMobSpawner(rand));
 else     System.err.println("String_Node_Str" + x + "String_Node_Str"+ y+ "String_Node_Str"+ z+ "String_Node_Str");
    return true;
  }
 else   return false;
}

Fixed version (ground truth):
@Override public boolean generate(World world,Random rand,int x,int y,int z){
  byte b0=3;
  int l=rand.nextInt(2) + 2;
  int i1=rand.nextInt(2) + 2;
  int j1=0, k1, l1, i2;
  for (k1=x - l - 1; k1 <= x + l + 1; ++k1) {
    for (l1=y - 1; l1 <= y + b0 + 1; ++l1) {
      for (i2=z - i1 - 1; i2 <= z + i1 + 1; ++i2) {
        Material material=world.getBlock(k1,l1,i2).getMaterial();
        if (l1 == y - 1 && !material.isSolid())         return false;
        if (l1 == y + b0 + 1 && !material.isSolid())         return false;
        if ((k1 == x - l - 1 || k1 == x + l + 1 || i2 == z - i1 - 1 || i2 == z + i1 + 1) && l1 == y && world.isAirBlock(k1,l1,i2) && world.isAirBlock(k1,l1 + 1,i2))         ++j1;
      }
    }
  }
  if (j1 >= 1 && j1 <= 5) {
    for (k1=x - l - 1; k1 <= x + l + 1; ++k1) {
      for (l1=y + b0; l1 >= y - 1; --l1) {
        for (i2=z - i1 - 1; i2 <= z + i1 + 1; ++i2) {
          if (k1 != x - l - 1 && l1 != y - 1 && i2 != z - i1 - 1 && k1 != x + l + 1 && l1 != y + b0 + 1 && i2 != z + i1 + 1)           world.setBlockToAir(k1,l1,i2);
 else           if (l1 >= 0 && !world.getBlock(k1,l1 - 1,i2).getMaterial().isSolid())           world.setBlockToAir(k1,l1,i2);
 else           if (world.getBlock(k1,l1,i2).getMaterial().isSolid()) {
            if (l1 == y - 1 && rand.nextInt(4) != 0)             world.setBlock(k1,l1,i2,VanillaBlocks.divineMossystone,0,2);
 else             world.setBlock(k1,l1,i2,Blocks.cobblestone,0,2);
          }
        }
      }
    }
    k1=0;
    while (k1 < 2) {
      l1=0;
      while (true) {
        if (l1 < 3) {
          label101: {
            i2=x + rand.nextInt(l * 2 + 1) - l;
            int j2=z + rand.nextInt(i1 * 2 + 1) - i1;
            if (world.isAirBlock(i2,y,j2)) {
              int k2=0;
              if (world.getBlock(i2 - 1,y,j2).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2 + 1,y,j2).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2,y,j2 - 1).getMaterial().isSolid())               ++k2;
              if (world.getBlock(i2,y,j2 + 1).getMaterial().isSolid())               ++k2;
              if (k2 == 1) {
                world.setBlock(i2,y,j2,Blocks.chest,0,2);
                TileEntityChest tileentitychest=(TileEntityChest)world.getTileEntity(i2,y,j2);
                if (tileentitychest != null) {
                  WeightedRandomChestContent.generateChestContents(rand,items,tileentitychest,5);
                }
                break label101;
              }
            }
            ++l1;
            continue;
          }
        }
        ++k1;
        break;
      }
    }
    world.setBlock(x,y,z,VanillaBlocks.divineMobSpawner,0,2);
    TileEntityStupidSpawner spawnerTE=(TileEntityStupidSpawner)world.getTileEntity(x,y,z);
    if (spawnerTE != null)     spawnerTE.setEntityName(this.pickMobSpawner(rand));
 else     System.err.println("String_Node_Str" + x + "String_Node_Str"+ y+ "String_Node_Str"+ z+ "String_Node_Str");
    return true;
  }
 else   return false;
}