diff --git a/src/main/java/com/amazon/ion/apps/BaseApp.java b/src/main/java/com/amazon/ion/apps/BaseApp.java
index 96ca1a5ea8..3dca74ddfe 100644
--- a/src/main/java/com/amazon/ion/apps/BaseApp.java
+++ b/src/main/java/com/amazon/ion/apps/BaseApp.java
@@ -1,18 +1,5 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file is distributed
- * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing
- * permissions and limitations under the License.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.apps;
 
 import com.amazon.ion.IonCatalog;
@@ -20,7 +7,6 @@
 import com.amazon.ion.IonReader;
 import com.amazon.ion.IonSystem;
 import com.amazon.ion.SymbolTable;
-import com.amazon.ion.impl._Private_IonConstants;
 import com.amazon.ion.system.IonSystemBuilder;
 import com.amazon.ion.system.SimpleCatalog;
 import java.io.BufferedInputStream;
diff --git a/src/main/java/com/amazon/ion/impl/IonCursorBinary.java b/src/main/java/com/amazon/ion/impl/IonCursorBinary.java
index 6166cfc381..2b01d173c8 100644
--- a/src/main/java/com/amazon/ion/impl/IonCursorBinary.java
+++ b/src/main/java/com/amazon/ion/impl/IonCursorBinary.java
@@ -943,10 +943,6 @@ private boolean slowReadFieldName_1_0() {
 
     /* ---- Ion 1.1 ---- */
 
-    private long uncheckedReadVarUInt_1_1() {
-        throw new UnsupportedOperationException();
-    }
-
     private long slowReadVarUInt_1_1() {
         throw new UnsupportedOperationException();
     }
diff --git a/src/main/java/com/amazon/ion/impl/IonReaderContinuableApplicationBinary.java b/src/main/java/com/amazon/ion/impl/IonReaderContinuableApplicationBinary.java
index 213c300415..dd78be4b87 100644
--- a/src/main/java/com/amazon/ion/impl/IonReaderContinuableApplicationBinary.java
+++ b/src/main/java/com/amazon/ion/impl/IonReaderContinuableApplicationBinary.java
@@ -11,7 +11,6 @@
 import com.amazon.ion.ReadOnlyValueException;
 import com.amazon.ion.SymbolTable;
 import com.amazon.ion.SymbolToken;
-import com.amazon.ion.SystemSymbols;
 import com.amazon.ion.UnknownSymbolException;
 import com.amazon.ion.ValueFactory;
 import com.amazon.ion.impl.bin.IntList;
@@ -20,7 +19,6 @@
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -42,13 +40,6 @@
  */
 class IonReaderContinuableApplicationBinary extends IonReaderContinuableCoreBinary implements IonReaderContinuableApplication {
 
-    // The UTF-8 encoded bytes representing the text `$ion_symbol_table`.
-    private static final byte[] ION_SYMBOL_TABLE_UTF8;
-
-    static {
-        ION_SYMBOL_TABLE_UTF8 = SystemSymbols.ION_SYMBOL_TABLE.getBytes(StandardCharsets.UTF_8);
-    }
-
     // An IonCatalog containing zero shared symbol tables.
     private static final IonCatalog EMPTY_CATALOG = new SimpleCatalog();
 
diff --git a/src/main/java/com/amazon/ion/impl/IonReaderContinuableCoreBinary.java b/src/main/java/com/amazon/ion/impl/IonReaderContinuableCoreBinary.java
index df501feb7f..08181d5d1b 100644
--- a/src/main/java/com/amazon/ion/impl/IonReaderContinuableCoreBinary.java
+++ b/src/main/java/com/amazon/ion/impl/IonReaderContinuableCoreBinary.java
@@ -1,6 +1,5 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
-
 package com.amazon.ion.impl;
 
 import com.amazon.ion.Decimal;
@@ -426,10 +425,6 @@ int readVarUInt_1_1() {
         throw new UnsupportedOperationException();
     }
 
-    private int readVarSym_1_1(Marker marker) {
-        throw new UnsupportedOperationException();
-    }
-
     private BigDecimal readBigDecimal_1_1() {
         throw new UnsupportedOperationException();
     }
diff --git a/src/main/java/com/amazon/ion/impl/IonWriterSystemBinary.java b/src/main/java/com/amazon/ion/impl/IonWriterSystemBinary.java
index 2b9dd26c73..06d66c38df 100644
--- a/src/main/java/com/amazon/ion/impl/IonWriterSystemBinary.java
+++ b/src/main/java/com/amazon/ion/impl/IonWriterSystemBinary.java
@@ -1,18 +1,5 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file is distributed
- * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing
- * permissions and limitations under the License.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl;
 
 import static com.amazon.ion.impl._Private_IonConstants.tidDATAGRAM;
@@ -265,10 +252,8 @@ static long[] growOne(long[] source, int newSize) {
     /** Ensure we don't use a closed {@link #output} stream. */
     private boolean _closed;
 
-    private final static int TID_FOR_SYMBOL_TABLE_PATCH = _Private_IonConstants.tidDATAGRAM + 1;
     private final static int DEFAULT_PATCH_COUNT        = 10;
     private final static int DEFAULT_PATCH_DEPTH        = 10;
-    private final static int NOT_A_SYMBOL_TABLE_IDX     = -1;
 
     // Patch:
     //          offset in data stream
@@ -385,11 +370,6 @@ public final boolean isInStruct()
         return _in_struct;
     }
 
-    private final boolean topInStruct() {
-        if (_top == 0) return false;
-        boolean in_struct = _patch_in_struct[_patch_stack[_top - 1]];
-        return in_struct;
-    }
     protected final boolean atDatagramLevel()
     {
         return (topType() == _Private_IonConstants.tidDATAGRAM);
@@ -440,10 +420,6 @@ final SymbolTable inject_local_symbol_table() throws IOException
         return symbols;
     }
 
-    private final int topLength() {
-        return _patch_lengths[_patch_stack[_top - 1]];
-    }
-
     private final int topType() {
         if (_top == 0) return _Private_IonConstants.tidDATAGRAM;
         return _patch_types[_patch_stack[_top - 1]];
diff --git a/src/main/java/com/amazon/ion/impl/UnifiedInputStreamX.java b/src/main/java/com/amazon/ion/impl/UnifiedInputStreamX.java
index 8356a9beea..2858ab3529 100644
--- a/src/main/java/com/amazon/ion/impl/UnifiedInputStreamX.java
+++ b/src/main/java/com/amazon/ion/impl/UnifiedInputStreamX.java
@@ -344,7 +344,6 @@ public final void skip(int skipDistance) throws IOException
                            + getPosition();
             throw new IOException(message);
         }
-        return;
     }
     // NB this method does not follow the contract of InputStream.read, it will return 0 at EOF
     //    It is unclear what the implication to the rest of the system to make it 'conform'
@@ -478,7 +477,6 @@ private void set_current_page(int new_page_idx, UnifiedDataPageX new_page, int p
 
         make_page_current(new_page, new_page_idx, pos, new_page.getBufferLimit());
 
-        return;
     }
     private int refill_is_eof() {
         _eof = true;
diff --git a/src/main/java/com/amazon/ion/impl/bin/IonEncoder_1_1.java b/src/main/java/com/amazon/ion/impl/bin/IonEncoder_1_1.java
index 7b1ca9d4b2..a543a54b47 100644
--- a/src/main/java/com/amazon/ion/impl/bin/IonEncoder_1_1.java
+++ b/src/main/java/com/amazon/ion/impl/bin/IonEncoder_1_1.java
@@ -1,7 +1,8 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl.bin;
 
 import com.amazon.ion.Decimal;
-import com.amazon.ion.IonText;
 import com.amazon.ion.IonType;
 import com.amazon.ion.Timestamp;
 import com.amazon.ion.impl.bin.utf8.Utf8StringEncoder;
@@ -9,7 +10,6 @@
 
 import java.math.BigDecimal;
 import java.math.BigInteger;
-import java.nio.charset.StandardCharsets;
 
 import static com.amazon.ion.impl.bin.Ion_1_1_Constants.*;
 import static java.lang.Double.doubleToRawLongBits;
diff --git a/src/main/java/com/amazon/ion/impl/bin/IonRawBinaryWriter.java b/src/main/java/com/amazon/ion/impl/bin/IonRawBinaryWriter.java
index 315d4bf204..e2073126c0 100644
--- a/src/main/java/com/amazon/ion/impl/bin/IonRawBinaryWriter.java
+++ b/src/main/java/com/amazon/ion/impl/bin/IonRawBinaryWriter.java
@@ -1,18 +1,5 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file is distributed
- * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing
- * permissions and limitations under the License.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl.bin;
 
 import static com.amazon.ion.Decimal.isNegativeZero;
@@ -57,7 +44,6 @@
 import java.math.BigInteger;
 import java.util.Iterator;
 import java.util.ListIterator;
-import java.util.NoSuchElementException;
 
 /**
  * Low-level binary {@link IonWriter} that understands encoding concerns but doesn't operate with any sense of symbol table management.
@@ -226,10 +212,6 @@ int numberOfLengthBytes() {
         }
     }
 
-    private static final byte STRING_TYPE_EXTENDED_LENGTH       = (byte) 0x8E;
-    private static final byte[] STRING_TYPED_PREALLOCATED_2     = makeTypedPreallocatedBytes(0x8E, 2);
-    private static final byte[] STRING_TYPED_PREALLOCATED_3     = makeTypedPreallocatedBytes(0x8E, 3);
-
     /** Max supported annotation length specifier size supported. */
     private static final int MAX_ANNOTATION_LENGTH = 0x7F;
 
@@ -601,16 +583,6 @@ private void addPatchPoint(final ContainerInfo container, final long position, f
         updateLength(patchLength - oldLength);
     }
 
-    /**
-     * This is used to reclaim the placeholder patch point after scan the current container.
-     * @param placeholderPatchIndex represents the index of the placeholder patch point.
-     */
-    private void reclaimPlaceholderPatchPoint(int placeholderPatchIndex) {
-        if (placeholderPatchIndex >= patchPoints.size() - 1) {
-            patchPoints.remove();
-        }
-    }
-
     private ContainerInfo popContainer()
     {
         final ContainerInfo currentContainer = containers.pop();
diff --git a/src/main/java/com/amazon/ion/impl/lite/IonTimestampLite.java b/src/main/java/com/amazon/ion/impl/lite/IonTimestampLite.java
index d7841c05fe..2eb8b4d791 100644
--- a/src/main/java/com/amazon/ion/impl/lite/IonTimestampLite.java
+++ b/src/main/java/com/amazon/ion/impl/lite/IonTimestampLite.java
@@ -1,18 +1,5 @@
-/*
- * Copyright 2007-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file is distributed
- * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
- * express or implied. See the License for the specific language governing
- * permissions and limitations under the License.
- */
-
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
 package com.amazon.ion.impl.lite;
 
 import com.amazon.ion.IonTimestamp;
@@ -32,12 +19,6 @@ final class IonTimestampLite
 {
     public final static Integer UTC_OFFSET = Timestamp.UTC_OFFSET;
 
-    private static final int BIT_FLAG_YEAR      = 0x01;
-    private static final int BIT_FLAG_MONTH     = 0x02;
-    private static final int BIT_FLAG_DAY       = 0x04;
-    private static final int BIT_FLAG_MINUTE    = 0x08;
-    private static final int BIT_FLAG_SECOND    = 0x10;
-    private static final int BIT_FLAG_FRACTION  = 0x20;
     private static final int HASH_SIGNATURE =
         IonType.TIMESTAMP.toString().hashCode();