A DESCRIPTION OF THE PROBLEM :

The grammar for an OrdinaryCompilationUnit is defined in JLS 7.3 as

OrdinaryCompilationUnit:
    [PackageDeclaration] {ImportDeclaration}
    {TopLevelClassOrInterfaceDeclaration}

The second line is missing an additional indentation and should read (per the convention of JLS 2.4):

OrdinaryCompilationUnit:
    [PackageDeclaration] {ImportDeclaration}
        {TopLevelClassOrInterfaceDeclaration}