https://logging.apache.org/log4j/2.x/log4j-core/: The Apache Log4j Implementation (The Apache Software Foundation)
  • Ralph Goers (Nextiva)
  • Gary Gregory (Rocket Software)
  • Scott Deboy
  • Remko Popma
  • Nick Williams
  • Matt Sicker (Independent Consultant)
  • Bruce Brouwer
  • Mikael Ståldal (Spotify) 
public final class org.apache.logging.log4j.core.appender.WriterAppender extends org.apache.logging.log4j.core.appender.AbstractWriterAppender<org.apache.logging.log4j.core.appender.WriterManager>
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.logging.log4j.core.appender.WriterAppender
  super_class: org.apache.logging.log4j.core.appender.AbstractWriterAppender
{
  private static org.apache.logging.log4j.core.appender.WriterAppender$WriterManagerFactory factory;
    descriptor: Lorg/apache/logging/log4j/core/appender/WriterAppender$WriterManagerFactory;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 131
            new org.apache.logging.log4j.core.appender.WriterAppender$WriterManagerFactory
            dup
            invokespecial org.apache.logging.log4j.core.appender.WriterAppender$WriterManagerFactory.<init>:()V
            putstatic org.apache.logging.log4j.core.appender.WriterAppender.factory:Lorg/apache/logging/log4j/core/appender/WriterAppender$WriterManagerFactory;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static org.apache.logging.log4j.core.appender.WriterAppender createAppender(org.apache.logging.log4j.core.StringLayout, org.apache.logging.log4j.core.Filter, java.io.Writer, java.lang.String, boolean, boolean);
    descriptor: (Lorg/apache/logging/log4j/core/StringLayout;Lorg/apache/logging/log4j/core/Filter;Ljava/io/Writer;Ljava/lang/String;ZZ)Lorg/apache/logging/log4j/core/appender/WriterAppender;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=8, locals=6, args_size=6
        start local 0 // org.apache.logging.log4j.core.StringLayout layout
        start local 1 // org.apache.logging.log4j.core.Filter filter
        start local 2 // java.io.Writer target
        start local 3 // java.lang.String name
        start local 4 // boolean follow
        start local 5 // boolean ignore
         0: .line 156
            aload 3 /* name */
            ifnonnull 3
         1: .line 157
            getstatic org.apache.logging.log4j.core.appender.WriterAppender.LOGGER:Lorg/apache/logging/log4j/Logger;
            ldc "No name provided for WriterAppender"
            invokeinterface org.apache.logging.log4j.Logger.error:(Ljava/lang/String;)V
         2: .line 158
            aconst_null
            areturn
         3: .line 160
      StackMap locals:
      StackMap stack:
            aload 0 /* layout */
            ifnonnull 5
         4: .line 161
            invokestatic org.apache.logging.log4j.core.layout.PatternLayout.createDefaultLayout:()Lorg/apache/logging/log4j/core/layout/PatternLayout;
            astore 0 /* layout */
         5: .line 163
      StackMap locals:
      StackMap stack:
            new org.apache.logging.log4j.core.appender.WriterAppender
            dup
            aload 3 /* name */
            aload 0 /* layout */
            aload 1 /* filter */
            aload 2 /* target */
            iload 4 /* follow */
            aload 0 /* layout */
            invokestatic org.apache.logging.log4j.core.appender.WriterAppender.getManager:(Ljava/io/Writer;ZLorg/apache/logging/log4j/core/StringLayout;)Lorg/apache/logging/log4j/core/appender/WriterManager;
            iload 5 /* ignore */
            invokespecial org.apache.logging.log4j.core.appender.WriterAppender.<init>:(Ljava/lang/String;Lorg/apache/logging/log4j/core/StringLayout;Lorg/apache/logging/log4j/core/Filter;Lorg/apache/logging/log4j/core/appender/WriterManager;Z)V
            areturn
        end local 5 // boolean ignore
        end local 4 // boolean follow
        end local 3 // java.lang.String name
        end local 2 // java.io.Writer target
        end local 1 // org.apache.logging.log4j.core.Filter filter
        end local 0 // org.apache.logging.log4j.core.StringLayout layout
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    6     0  layout  Lorg/apache/logging/log4j/core/StringLayout;
            0    6     1  filter  Lorg/apache/logging/log4j/core/Filter;
            0    6     2  target  Ljava/io/Writer;
            0    6     3    name  Ljava/lang/String;
            0    6     4  follow  Z
            0    6     5  ignore  Z
    RuntimeVisibleAnnotations: 
      org.apache.logging.log4j.core.config.plugins.PluginFactory()
    MethodParameters:
        Name  Flags
      layout  
      filter  final
      target  final
      name    final
      follow  final
      ignore  final

  private static org.apache.logging.log4j.core.appender.WriterManager getManager(java.io.Writer, boolean, org.apache.logging.log4j.core.StringLayout);
    descriptor: (Ljava/io/Writer;ZLorg/apache/logging/log4j/core/StringLayout;)Lorg/apache/logging/log4j/core/appender/WriterManager;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=6, locals=5, args_size=3
        start local 0 // java.io.Writer target
        start local 1 // boolean follow
        start local 2 // org.apache.logging.log4j.core.StringLayout layout
         0: .line 167
            new org.apache.logging.log4j.core.util.CloseShieldWriter
            dup
            aload 0 /* target */
            invokespecial org.apache.logging.log4j.core.util.CloseShieldWriter.<init>:(Ljava/io/Writer;)V
            astore 3 /* writer */
        start local 3 // java.io.Writer writer
         1: .line 168
            new java.lang.StringBuilder
            dup
            aload 0 /* target */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc "@"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* target */
            invokevirtual java.lang.Object.hashCode:()I
            invokestatic java.lang.Integer.toHexString:(I)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            bipush 46
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         2: .line 169
            iload 1 /* follow */
            invokevirtual java.lang.StringBuilder.append:(Z)Ljava/lang/StringBuilder;
         3: .line 168
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            astore 4 /* managerName */
        start local 4 // java.lang.String managerName
         4: .line 170
            aload 4 /* managerName */
            new org.apache.logging.log4j.core.appender.WriterAppender$FactoryData
            dup
            aload 3 /* writer */
            aload 4 /* managerName */
            aload 2 /* layout */
            invokespecial org.apache.logging.log4j.core.appender.WriterAppender$FactoryData.<init>:(Ljava/io/Writer;Ljava/lang/String;Lorg/apache/logging/log4j/core/StringLayout;)V
            getstatic org.apache.logging.log4j.core.appender.WriterAppender.factory:Lorg/apache/logging/log4j/core/appender/WriterAppender$WriterManagerFactory;
            invokestatic org.apache.logging.log4j.core.appender.WriterManager.getManager:(Ljava/lang/String;Ljava/lang/Object;Lorg/apache/logging/log4j/core/appender/ManagerFactory;)Lorg/apache/logging/log4j/core/appender/WriterManager;
            areturn
        end local 4 // java.lang.String managerName
        end local 3 // java.io.Writer writer
        end local 2 // org.apache.logging.log4j.core.StringLayout layout
        end local 1 // boolean follow
        end local 0 // java.io.Writer target
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    5     0       target  Ljava/io/Writer;
            0    5     1       follow  Z
            0    5     2       layout  Lorg/apache/logging/log4j/core/StringLayout;
            1    5     3       writer  Ljava/io/Writer;
            4    5     4  managerName  Ljava/lang/String;
    MethodParameters:
        Name  Flags
      target  final
      follow  final
      layout  final

  public static org.apache.logging.log4j.core.appender.WriterAppender$Builder newBuilder();
    descriptor: ()Lorg/apache/logging/log4j/core/appender/WriterAppender$Builder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 175
            new org.apache.logging.log4j.core.appender.WriterAppender$Builder
            dup
            invokespecial org.apache.logging.log4j.core.appender.WriterAppender$Builder.<init>:()V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    RuntimeVisibleAnnotations: 
      org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory()

  private void <init>(java.lang.String, org.apache.logging.log4j.core.StringLayout, org.apache.logging.log4j.core.Filter, org.apache.logging.log4j.core.appender.WriterManager, boolean);
    descriptor: (Ljava/lang/String;Lorg/apache/logging/log4j/core/StringLayout;Lorg/apache/logging/log4j/core/Filter;Lorg/apache/logging/log4j/core/appender/WriterManager;Z)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=7, locals=6, args_size=6
        start local 0 // org.apache.logging.log4j.core.appender.WriterAppender this
        start local 1 // java.lang.String name
        start local 2 // org.apache.logging.log4j.core.StringLayout layout
        start local 3 // org.apache.logging.log4j.core.Filter filter
        start local 4 // org.apache.logging.log4j.core.appender.WriterManager manager
        start local 5 // boolean ignoreExceptions
         0: .line 180
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* layout */
            aload 3 /* filter */
            iload 5 /* ignoreExceptions */
            iconst_1
            aload 4 /* manager */
            invokespecial org.apache.logging.log4j.core.appender.AbstractWriterAppender.<init>:(Ljava/lang/String;Lorg/apache/logging/log4j/core/StringLayout;Lorg/apache/logging/log4j/core/Filter;ZZLorg/apache/logging/log4j/core/appender/WriterManager;)V
         1: .line 181
            return
        end local 5 // boolean ignoreExceptions
        end local 4 // org.apache.logging.log4j.core.appender.WriterManager manager
        end local 3 // org.apache.logging.log4j.core.Filter filter
        end local 2 // org.apache.logging.log4j.core.StringLayout layout
        end local 1 // java.lang.String name
        end local 0 // org.apache.logging.log4j.core.appender.WriterAppender this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    2     0              this  Lorg/apache/logging/log4j/core/appender/WriterAppender;
            0    2     1              name  Ljava/lang/String;
            0    2     2            layout  Lorg/apache/logging/log4j/core/StringLayout;
            0    2     3            filter  Lorg/apache/logging/log4j/core/Filter;
            0    2     4           manager  Lorg/apache/logging/log4j/core/appender/WriterManager;
            0    2     5  ignoreExceptions  Z
    MethodParameters:
                  Name  Flags
      name              final
      layout            final
      filter            final
      manager           final
      ignoreExceptions  final
}
Signature: Lorg/apache/logging/log4j/core/appender/AbstractWriterAppender<Lorg/apache/logging/log4j/core/appender/WriterManager;>;
SourceFile: "WriterAppender.java"
NestMembers:
  org.apache.logging.log4j.core.appender.WriterAppender$Builder  org.apache.logging.log4j.core.appender.WriterAppender$FactoryData  org.apache.logging.log4j.core.appender.WriterAppender$WriterManagerFactory
InnerClasses:
  public Builder = org.apache.logging.log4j.core.appender.WriterAppender$Builder of org.apache.logging.log4j.core.appender.WriterAppender
  private FactoryData = org.apache.logging.log4j.core.appender.WriterAppender$FactoryData of org.apache.logging.log4j.core.appender.WriterAppender
  private WriterManagerFactory = org.apache.logging.log4j.core.appender.WriterAppender$WriterManagerFactory of org.apache.logging.log4j.core.appender.WriterAppender
    RuntimeVisibleAnnotations: 
      org.apache.logging.log4j.core.config.plugins.Plugin(name = "Writer", category = "Core", elementType = "appender", printObject = true)