https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
public class freemarker.core.NonSequenceOrCollectionException extends freemarker.core.UnexpectedTypeException
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: freemarker.core.NonSequenceOrCollectionException
  super_class: freemarker.core.UnexpectedTypeException
{
  private static final java.lang.Class[] EXPECTED_TYPES;
    descriptor: [Ljava/lang/Class;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final java.lang.String ITERABLE_SUPPORT_HINT;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "The problematic value is a java.lang.Iterable. Using DefaultObjectWrapper(..., iterableSupport=true) as the object_wrapper setting of the FreeMarker configuration should solve this."

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 36
            iconst_2
            anewarray java.lang.Class
            dup
            iconst_0
         1: .line 37
            ldc Lfreemarker/template/TemplateSequenceModel;
            aastore
            dup
            iconst_1
            ldc Lfreemarker/template/TemplateCollectionModel;
            aastore
         2: .line 36
            putstatic freemarker.core.NonSequenceOrCollectionException.EXPECTED_TYPES:[Ljava/lang/Class;
         3: .line 41
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(freemarker.core.Environment);
    descriptor: (Lfreemarker/core/Environment;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // freemarker.core.Environment env
         0: .line 44
            aload 0 /* this */
            aload 1 /* env */
            ldc "Expecting sequence or collection value here"
            invokespecial freemarker.core.UnexpectedTypeException.<init>:(Lfreemarker/core/Environment;Ljava/lang/String;)V
         1: .line 45
            return
        end local 1 // freemarker.core.Environment env
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1   env  Lfreemarker/core/Environment;
    MethodParameters:
      Name  Flags
      env   

  public void <init>(java.lang.String, freemarker.core.Environment);
    descriptor: (Ljava/lang/String;Lfreemarker/core/Environment;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // java.lang.String description
        start local 2 // freemarker.core.Environment env
         0: .line 48
            aload 0 /* this */
            aload 2 /* env */
            aload 1 /* description */
            invokespecial freemarker.core.UnexpectedTypeException.<init>:(Lfreemarker/core/Environment;Ljava/lang/String;)V
         1: .line 49
            return
        end local 2 // freemarker.core.Environment env
        end local 1 // java.lang.String description
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0         this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1  description  Ljava/lang/String;
            0    2     2          env  Lfreemarker/core/Environment;
    MethodParameters:
             Name  Flags
      description  
      env          

  void <init>(freemarker.core.Environment, freemarker.core._ErrorDescriptionBuilder);
    descriptor: (Lfreemarker/core/Environment;Lfreemarker/core/_ErrorDescriptionBuilder;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // freemarker.core.Environment env
        start local 2 // freemarker.core._ErrorDescriptionBuilder description
         0: .line 52
            aload 0 /* this */
            aload 1 /* env */
            aload 2 /* description */
            invokespecial freemarker.core.UnexpectedTypeException.<init>:(Lfreemarker/core/Environment;Lfreemarker/core/_ErrorDescriptionBuilder;)V
         1: .line 53
            return
        end local 2 // freemarker.core._ErrorDescriptionBuilder description
        end local 1 // freemarker.core.Environment env
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0         this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1          env  Lfreemarker/core/Environment;
            0    2     2  description  Lfreemarker/core/_ErrorDescriptionBuilder;
    MethodParameters:
             Name  Flags
      env          
      description  

  void <init>(freemarker.core.Expression, freemarker.template.TemplateModel, freemarker.core.Environment);
    descriptor: (Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;Lfreemarker/core/Environment;)V
    flags: (0x0000) 
    Code:
      stack=5, locals=4, args_size=4
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // freemarker.core.Expression blamed
        start local 2 // freemarker.template.TemplateModel model
        start local 3 // freemarker.core.Environment env
         0: .line 58
            aload 0 /* this */
            aload 1 /* blamed */
            aload 2 /* model */
            getstatic freemarker.template.utility.CollectionUtils.EMPTY_OBJECT_ARRAY:[Ljava/lang/Object;
            aload 3 /* env */
            invokespecial freemarker.core.NonSequenceOrCollectionException.<init>:(Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;[Ljava/lang/Object;Lfreemarker/core/Environment;)V
         1: .line 59
            return
        end local 3 // freemarker.core.Environment env
        end local 2 // freemarker.template.TemplateModel model
        end local 1 // freemarker.core.Expression blamed
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1  blamed  Lfreemarker/core/Expression;
            0    2     2   model  Lfreemarker/template/TemplateModel;
            0    2     3     env  Lfreemarker/core/Environment;
    Exceptions:
      throws freemarker.core.InvalidReferenceException
    MethodParameters:
        Name  Flags
      blamed  
      model   
      env     

  void <init>(freemarker.core.Expression, freemarker.template.TemplateModel, java.lang.String, freemarker.core.Environment);
    descriptor: (Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;Ljava/lang/String;Lfreemarker/core/Environment;)V
    flags: (0x0000) 
    Code:
      stack=7, locals=5, args_size=5
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // freemarker.core.Expression blamed
        start local 2 // freemarker.template.TemplateModel model
        start local 3 // java.lang.String tip
        start local 4 // freemarker.core.Environment env
         0: .line 65
            aload 0 /* this */
            aload 1 /* blamed */
            aload 2 /* model */
            iconst_1
            anewarray java.lang.Object
            dup
            iconst_0
            aload 3 /* tip */
            aastore
            aload 4 /* env */
            invokespecial freemarker.core.NonSequenceOrCollectionException.<init>:(Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;[Ljava/lang/Object;Lfreemarker/core/Environment;)V
         1: .line 66
            return
        end local 4 // freemarker.core.Environment env
        end local 3 // java.lang.String tip
        end local 2 // freemarker.template.TemplateModel model
        end local 1 // freemarker.core.Expression blamed
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1  blamed  Lfreemarker/core/Expression;
            0    2     2   model  Lfreemarker/template/TemplateModel;
            0    2     3     tip  Ljava/lang/String;
            0    2     4     env  Lfreemarker/core/Environment;
    Exceptions:
      throws freemarker.core.InvalidReferenceException
    MethodParameters:
        Name  Flags
      blamed  
      model   
      tip     
      env     

  void <init>(freemarker.core.Expression, freemarker.template.TemplateModel, java.lang.Object[], freemarker.core.Environment);
    descriptor: (Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;[Ljava/lang/Object;Lfreemarker/core/Environment;)V
    flags: (0x0000) 
    Code:
      stack=7, locals=5, args_size=5
        start local 0 // freemarker.core.NonSequenceOrCollectionException this
        start local 1 // freemarker.core.Expression blamed
        start local 2 // freemarker.template.TemplateModel model
        start local 3 // java.lang.Object[] tips
        start local 4 // freemarker.core.Environment env
         0: .line 70
            aload 0 /* this */
            aload 1 /* blamed */
            aload 2 /* model */
            ldc "sequence or collection"
            getstatic freemarker.core.NonSequenceOrCollectionException.EXPECTED_TYPES:[Ljava/lang/Class;
            aload 2 /* model */
            aload 3 /* tips */
            invokestatic freemarker.core.NonSequenceOrCollectionException.extendTipsIfIterable:(Lfreemarker/template/TemplateModel;[Ljava/lang/Object;)[Ljava/lang/Object;
            aload 4 /* env */
            invokespecial freemarker.core.UnexpectedTypeException.<init>:(Lfreemarker/core/Expression;Lfreemarker/template/TemplateModel;Ljava/lang/String;[Ljava/lang/Class;[Ljava/lang/Object;Lfreemarker/core/Environment;)V
         1: .line 71
            return
        end local 4 // freemarker.core.Environment env
        end local 3 // java.lang.Object[] tips
        end local 2 // freemarker.template.TemplateModel model
        end local 1 // freemarker.core.Expression blamed
        end local 0 // freemarker.core.NonSequenceOrCollectionException this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lfreemarker/core/NonSequenceOrCollectionException;
            0    2     1  blamed  Lfreemarker/core/Expression;
            0    2     2   model  Lfreemarker/template/TemplateModel;
            0    2     3    tips  [Ljava/lang/Object;
            0    2     4     env  Lfreemarker/core/Environment;
    Exceptions:
      throws freemarker.core.InvalidReferenceException
    MethodParameters:
        Name  Flags
      blamed  
      model   
      tips    
      env     

  private static java.lang.Object[] extendTipsIfIterable(freemarker.template.TemplateModel, java.lang.Object[]);
    descriptor: (Lfreemarker/template/TemplateModel;[Ljava/lang/Object;)[Ljava/lang/Object;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=5, args_size=2
        start local 0 // freemarker.template.TemplateModel model
        start local 1 // java.lang.Object[] tips
         0: .line 74
            aload 0 /* model */
            invokestatic freemarker.core.NonSequenceOrCollectionException.isWrappedIterable:(Lfreemarker/template/TemplateModel;)Z
            ifeq 12
         1: .line 75
            aload 1 /* tips */
            ifnull 2
            aload 1 /* tips */
            arraylength
            goto 3
      StackMap locals:
      StackMap stack:
         2: iconst_0
      StackMap locals:
      StackMap stack: int
         3: istore 2 /* tipsLen */
        start local 2 // int tipsLen
         4: .line 76
            iload 2 /* tipsLen */
            iconst_1
            iadd
            anewarray java.lang.Object
            astore 3 /* extendedTips */
        start local 3 // java.lang.Object[] extendedTips
         5: .line 77
            iconst_0
            istore 4 /* i */
        start local 4 // int i
         6: goto 9
         7: .line 78
      StackMap locals: int java.lang.Object[] int
      StackMap stack:
            aload 3 /* extendedTips */
            iload 4 /* i */
            aload 1 /* tips */
            iload 4 /* i */
            aaload
            aastore
         8: .line 77
            iinc 4 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 4 /* i */
            iload 2 /* tipsLen */
            if_icmplt 7
        end local 4 // int i
        10: .line 80
            aload 3 /* extendedTips */
            iload 2 /* tipsLen */
            ldc "The problematic value is a java.lang.Iterable. Using DefaultObjectWrapper(..., iterableSupport=true) as the object_wrapper setting of the FreeMarker configuration should solve this."
            aastore
        11: .line 81
            aload 3 /* extendedTips */
            areturn
        end local 3 // java.lang.Object[] extendedTips
        end local 2 // int tipsLen
        12: .line 83
      StackMap locals:
      StackMap stack:
            aload 1 /* tips */
            areturn
        end local 1 // java.lang.Object[] tips
        end local 0 // freemarker.template.TemplateModel model
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0   13     0         model  Lfreemarker/template/TemplateModel;
            0   13     1          tips  [Ljava/lang/Object;
            4   12     2       tipsLen  I
            5   12     3  extendedTips  [Ljava/lang/Object;
            6   10     4             i  I
    MethodParameters:
       Name  Flags
      model  
      tips   

  public static boolean isWrappedIterable(freemarker.template.TemplateModel);
    descriptor: (Lfreemarker/template/TemplateModel;)Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.template.TemplateModel model
         0: .line 88
            aload 0 /* model */
            instanceof freemarker.ext.util.WrapperTemplateModel
            ifeq 3
         1: .line 89
            aload 0 /* model */
            checkcast freemarker.ext.util.WrapperTemplateModel
            invokeinterface freemarker.ext.util.WrapperTemplateModel.getWrappedObject:()Ljava/lang/Object;
            instanceof java.lang.Iterable
            ifeq 3
         2: .line 88
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         3: iconst_0
            ireturn
        end local 0 // freemarker.template.TemplateModel model
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0  model  Lfreemarker/template/TemplateModel;
    MethodParameters:
       Name  Flags
      model  
}
SourceFile: "NonSequenceOrCollectionException.java"