diff --git a/classes/java/lang/ArithmeticException.java b/classes/java/lang/ArithmeticException.java
index 94fbd04..2ea5089 100644
--- a/classes/java/lang/ArithmeticException.java
+++ b/classes/java/lang/ArithmeticException.java
@@ -1,4 +1,12 @@
 package java.lang;
 
 public class ArithmeticException extends RuntimeException {
+
+    public ArithmeticException() {
+        super();
+    }
+
+    public ArithmeticException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/ArrayIndexOutOfBoundsException.java b/classes/java/lang/ArrayIndexOutOfBoundsException.java
index 30cb3af..0461b9d 100644
--- a/classes/java/lang/ArrayIndexOutOfBoundsException.java
+++ b/classes/java/lang/ArrayIndexOutOfBoundsException.java
@@ -1,4 +1,16 @@
 package java.lang;
 
 public class ArrayIndexOutOfBoundsException extends IndexOutOfBoundsException {
+
+    ArrayIndexOutOfBoundsException() {
+        super();
+    }
+
+    ArrayIndexOutOfBoundsException(int index) {
+        super(String.valueOf(index));
+    }
+
+    ArrayIndexOutOfBoundsException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/ArrayStoreException.java b/classes/java/lang/ArrayStoreException.java
index 9e9832b..12974c4 100644
--- a/classes/java/lang/ArrayStoreException.java
+++ b/classes/java/lang/ArrayStoreException.java
@@ -1,4 +1,11 @@
 package java.lang;
 
 public class ArrayStoreException extends RuntimeException {
+    public ArrayStoreException() {
+        super();
+    }
+
+    public ArrayStoreException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/ClassCastException.java b/classes/java/lang/ClassCastException.java
index 9f4bd5d..f81c42f 100644
--- a/classes/java/lang/ClassCastException.java
+++ b/classes/java/lang/ClassCastException.java
@@ -1,4 +1,12 @@
 package java.lang;
 
 public class ClassCastException extends RuntimeException {
+
+    public ClassCastException() {
+        super();
+    }
+
+    public ClassCastException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/ClassNotFoundException.java b/classes/java/lang/ClassNotFoundException.java
new file mode 100644
index 0000000..b20ddb5
--- /dev/null
+++ b/classes/java/lang/ClassNotFoundException.java
@@ -0,0 +1,17 @@
+package java.lang;
+
+public class ClassNotFoundException extends RuntimeException {
+
+    public ClassNotFoundException() {
+        super();
+    }
+
+    public ClassNotFoundException(String s) {
+        super(s);
+    }
+
+    public ClassNotFoundException(String s,
+                                  Throwable ex) {
+        super(s, ex);
+    }
+}
diff --git a/classes/java/lang/CloneNotSupportedException.java b/classes/java/lang/CloneNotSupportedException.java
new file mode 100644
index 0000000..96d0b94
--- /dev/null
+++ b/classes/java/lang/CloneNotSupportedException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class CloneNotSupportedException extends RuntimeException {
+
+    public CloneNotSupportedException() {
+        super();
+    }
+
+    public CloneNotSupportedException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/IllegalAccessException.java b/classes/java/lang/IllegalAccessException.java
new file mode 100644
index 0000000..5e904ce
--- /dev/null
+++ b/classes/java/lang/IllegalAccessException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class IllegalAccessException extends Exception {
+
+    public IllegalAccessException() {
+        super();
+    }
+
+    public IllegalAccessException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/IllegalArgumentException.java b/classes/java/lang/IllegalArgumentException.java
new file mode 100644
index 0000000..4a0fbdb
--- /dev/null
+++ b/classes/java/lang/IllegalArgumentException.java
@@ -0,0 +1,21 @@
+package java.lang;
+
+public class IllegalArgumentException extends RuntimeException {
+
+    public IllegalArgumentException() {
+        super();
+    }
+
+    public IllegalArgumentException(String s) {
+        super(s);
+    }
+
+    public IllegalArgumentException(String message,
+                                    Throwable cause) {
+        super(message, cause);
+    }
+
+    public IllegalArgumentException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/classes/java/lang/IllegalMonitorStateException.java b/classes/java/lang/IllegalMonitorStateException.java
new file mode 100644
index 0000000..d1a7b88
--- /dev/null
+++ b/classes/java/lang/IllegalMonitorStateException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class IllegalMonitorStateException extends RuntimeException {
+
+    public IllegalMonitorStateException() {
+        super();
+    }
+
+    public IllegalMonitorStateException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/IllegalStateException.java b/classes/java/lang/IllegalStateException.java
new file mode 100644
index 0000000..f3f939c
--- /dev/null
+++ b/classes/java/lang/IllegalStateException.java
@@ -0,0 +1,21 @@
+package java.lang;
+
+public class IllegalStateException extends RuntimeException {
+
+    public IllegalStateException() {
+        super();
+    }
+
+    public IllegalStateException(String s) {
+        super(s);
+    }
+
+    public IllegalStateException(String message,
+                                 Throwable cause) {
+        super(message, cause);
+    }
+
+    public IllegalStateException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/classes/java/lang/IllegalThreadStateException.java b/classes/java/lang/IllegalThreadStateException.java
new file mode 100644
index 0000000..f16e58c
--- /dev/null
+++ b/classes/java/lang/IllegalThreadStateException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class IllegalThreadStateException extends RuntimeException {
+
+    public IllegalThreadStateException() {
+        super();
+    }
+
+    public IllegalThreadStateException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/IndexOutOfBoundsException.java b/classes/java/lang/IndexOutOfBoundsException.java
index 6fef203..c7f19c6 100644
--- a/classes/java/lang/IndexOutOfBoundsException.java
+++ b/classes/java/lang/IndexOutOfBoundsException.java
@@ -1,4 +1,12 @@
 package java.lang;
 
 public class IndexOutOfBoundsException extends RuntimeException {
+
+    public IndexOutOfBoundsException() {
+        super();
+    }
+
+    public IndexOutOfBoundsException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/InstantiationException.java b/classes/java/lang/InstantiationException.java
new file mode 100644
index 0000000..06e85b1
--- /dev/null
+++ b/classes/java/lang/InstantiationException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class InstantiationException extends Exception {
+
+    public InstantiationException() {
+        super();
+    }
+
+    public InstantiationException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/InterruptedException.java b/classes/java/lang/InterruptedException.java
new file mode 100644
index 0000000..d053f7f
--- /dev/null
+++ b/classes/java/lang/InterruptedException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class InterruptedException extends Exception {
+
+    public InterruptedException() {
+        super();
+    }
+
+    public InterruptedException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/NegativeArraySizeException.java b/classes/java/lang/NegativeArraySizeException.java
index ec7cea1..8ebc30b 100644
--- a/classes/java/lang/NegativeArraySizeException.java
+++ b/classes/java/lang/NegativeArraySizeException.java
@@ -1,4 +1,12 @@
 package java.lang;
 
 public class NegativeArraySizeException extends RuntimeException {
+
+    public NegativeArraySizeException() {
+        super();
+    }
+
+    public NegativeArraySizeException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/NullPointerException.java b/classes/java/lang/NullPointerException.java
index 9922a45..86cf82d 100644
--- a/classes/java/lang/NullPointerException.java
+++ b/classes/java/lang/NullPointerException.java
@@ -1,4 +1,12 @@
 package java.lang;
 
 public class NullPointerException extends RuntimeException {
+
+    public NullPointerException() {
+        super();
+    }
+
+    public NullPointerException(String s) {
+        super(s);
+    }
 }
diff --git a/classes/java/lang/NumberFormatException.java b/classes/java/lang/NumberFormatException.java
new file mode 100644
index 0000000..08e1f7e
--- /dev/null
+++ b/classes/java/lang/NumberFormatException.java
@@ -0,0 +1,12 @@
+package java.lang;
+
+public class NumberFormatException extends IllegalArgumentException {
+
+    public NumberFormatException() {
+        super();
+    }
+
+    public NumberFormatException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/RuntimeException.java b/classes/java/lang/RuntimeException.java
index 3be7f77..6028eaa 100644
--- a/classes/java/lang/RuntimeException.java
+++ b/classes/java/lang/RuntimeException.java
@@ -1,4 +1,20 @@
 package java.lang;
 
 public class RuntimeException extends Exception {
+    public RuntimeException() {
+        super();
+    }
+
+    public RuntimeException(String message) {
+        super(message);
+    }
+
+    public RuntimeException(String message,
+                            Throwable cause) {
+        super(message, cause);
+    }
+
+    public RuntimeException(Throwable cause) {
+        super(cause);
+    }
 }
diff --git a/classes/java/lang/SecurityException.java b/classes/java/lang/SecurityException.java
new file mode 100644
index 0000000..db8c828
--- /dev/null
+++ b/classes/java/lang/SecurityException.java
@@ -0,0 +1,21 @@
+package java.lang;
+
+public class SecurityException extends RuntimeException {
+
+    public SecurityException() {
+        super();
+    }
+
+    public SecurityException(String s) {
+        super(s);
+    }
+
+    public SecurityException(String message,
+                             Throwable cause) {
+        super(message, cause);
+    }
+
+    public SecurityException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/classes/java/lang/StringIndexOutOfBoundsException.java b/classes/java/lang/StringIndexOutOfBoundsException.java
new file mode 100644
index 0000000..c8578e8
--- /dev/null
+++ b/classes/java/lang/StringIndexOutOfBoundsException.java
@@ -0,0 +1,16 @@
+package java.lang;
+
+public class StringIndexOutOfBoundsException extends IndexOutOfBoundsException {
+
+    public StringIndexOutOfBoundsException() {
+        super();
+    }
+
+    public StringIndexOutOfBoundsException(int index) {
+        super(index);
+    }
+
+    public StringIndexOutOfBoundsException(String s) {
+        super(s);
+    }
+}
diff --git a/classes/java/lang/UnsupportedOperationException.java b/classes/java/lang/UnsupportedOperationException.java
new file mode 100644
index 0000000..e57f496
--- /dev/null
+++ b/classes/java/lang/UnsupportedOperationException.java
@@ -0,0 +1,4 @@
+package java.lang;
+
+public class UnsupportedOperationException extends RuntimeException {
+}