Mixing
StreamCorruptedException: invalid stream header: 79737200 when reading objects from a file
I create a client similarity, where clients register an account (an object is created) which is stored in a file.
Objects are written to the file as required, I override the writeStreamHeader() method. But when I try to read them all, their file throws an exception.
Write the objects to the file here.
public static void saveAccaunt(LoginAndPass gamers) {
boolean b = true;
FileInputStream fis = null;
try{
fis = new FileInputStream("student.ser");
fis.close();
}
catch (FileNotFoundException e)
{
b = false;
} catch (IOException e) {
e.printStackTrace();
}
try {
FileOutputStream fileOutputStream = new FileOutputStream("student.ser",true);
ObjectOutputStream os = null;
if(b = true){
os = new AppendingObjectOutputStream(fileOutputStream);
System.out.println("Объект добавлен!");
}else {
os = new ObjectOutputStream(fileOutputStream);
System.out.println("Создан");
}
os.writeObject(gamers);
os.close();
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String args) {
try {
FileInputStream fileInputStream = new FileInputStream("student.ser");
ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
test = new ArrayList<>();
while (true){
test.add(objectInputStream.readObject());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
System.out.println(test.get(0));
}
Here is the error log for the exception thrown:
java.io.StreamCorruptedException: invalid stream header: 79737200
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:866)
at java.io.ObjectInputStream.(ObjectInputStream.java:358)
at Registratsiya.AllGamers.main(AllGamers.java:48)
Exception in thread "main" java.lang.NullPointerException
at Registratsiya.AllGamers.main(AllGamers.java:61)
java objectinputstream objectoutputstream
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
add a comment |
I create a client similarity, where clients register an account (an object is created) which is stored in a file.
Objects are written to the file as required, I override the writeStreamHeader() method. But when I try to read them all, their file throws an exception.
Write the objects to the file here.
public static void saveAccaunt(LoginAndPass gamers) {
boolean b = true;
FileInputStream fis = null;
try{
fis = new FileInputStream("student.ser");
fis.close();
}
catch (FileNotFoundException e)
{
b = false;
} catch (IOException e) {
e.printStackTrace();
}
try {
FileOutputStream fileOutputStream = new FileOutputStream("student.ser",true);
ObjectOutputStream os = null;
if(b = true){
os = new AppendingObjectOutputStream(fileOutputStream);
System.out.println("Объект добавлен!");
}else {
os = new ObjectOutputStream(fileOutputStream);
System.out.println("Создан");
}
os.writeObject(gamers);
os.close();
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String args) {
try {
FileInputStream fileInputStream = new FileInputStream("student.ser");
ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
test = new ArrayList<>();
while (true){
test.add(objectInputStream.readObject());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
System.out.println(test.get(0));
}
Here is the error log for the exception thrown:
java.io.StreamCorruptedException: invalid stream header: 79737200
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:866)
at java.io.ObjectInputStream.(ObjectInputStream.java:358)
at Registratsiya.AllGamers.main(AllGamers.java:48)
Exception in thread "main" java.lang.NullPointerException
at Registratsiya.AllGamers.main(AllGamers.java:61)
java objectinputstream objectoutputstream
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
5
I think that the problem is this:if(b = true){. Note that you have mistakenly used=instead of==. This means that you will be calling yourAppendingObjectOutputStreamevery time, and that (presumably) means there will be no valid stream header.
– Stephen C
Feb 21 at 12:22
And note thatif (b)is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.
– user207421
Feb 21 at 14:19
add a comment |
I create a client similarity, where clients register an account (an object is created) which is stored in a file.
Objects are written to the file as required, I override the writeStreamHeader() method. But when I try to read them all, their file throws an exception.
Write the objects to the file here.
public static void saveAccaunt(LoginAndPass gamers) {
boolean b = true;
FileInputStream fis = null;
try{
fis = new FileInputStream("student.ser");
fis.close();
}
catch (FileNotFoundException e)
{
b = false;
} catch (IOException e) {
e.printStackTrace();
}
try {
FileOutputStream fileOutputStream = new FileOutputStream("student.ser",true);
ObjectOutputStream os = null;
if(b = true){
os = new AppendingObjectOutputStream(fileOutputStream);
System.out.println("Объект добавлен!");
}else {
os = new ObjectOutputStream(fileOutputStream);
System.out.println("Создан");
}
os.writeObject(gamers);
os.close();
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String args) {
try {
FileInputStream fileInputStream = new FileInputStream("student.ser");
ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
test = new ArrayList<>();
while (true){
test.add(objectInputStream.readObject());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
System.out.println(test.get(0));
}
Here is the error log for the exception thrown:
java.io.StreamCorruptedException: invalid stream header: 79737200
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:866)
at java.io.ObjectInputStream.(ObjectInputStream.java:358)
at Registratsiya.AllGamers.main(AllGamers.java:48)
Exception in thread "main" java.lang.NullPointerException
at Registratsiya.AllGamers.main(AllGamers.java:61)
java objectinputstream objectoutputstream
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
I create a client similarity, where clients register an account (an object is created) which is stored in a file.
Objects are written to the file as required, I override the writeStreamHeader() method. But when I try to read them all, their file throws an exception.
Write the objects to the file here.
public static void saveAccaunt(LoginAndPass gamers) {
boolean b = true;
FileInputStream fis = null;
try{
fis = new FileInputStream("student.ser");
fis.close();
}
catch (FileNotFoundException e)
{
b = false;
} catch (IOException e) {
e.printStackTrace();
}
try {
FileOutputStream fileOutputStream = new FileOutputStream("student.ser",true);
ObjectOutputStream os = null;
if(b = true){
os = new AppendingObjectOutputStream(fileOutputStream);
System.out.println("Объект добавлен!");
}else {
os = new ObjectOutputStream(fileOutputStream);
System.out.println("Создан");
}
os.writeObject(gamers);
os.close();
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String args) {
try {
FileInputStream fileInputStream = new FileInputStream("student.ser");
ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
test = new ArrayList<>();
while (true){
test.add(objectInputStream.readObject());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
System.out.println(test.get(0));
}
Here is the error log for the exception thrown:
java.io.StreamCorruptedException: invalid stream header: 79737200
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:866)
at java.io.ObjectInputStream.(ObjectInputStream.java:358)
at Registratsiya.AllGamers.main(AllGamers.java:48)
Exception in thread "main" java.lang.NullPointerException
at Registratsiya.AllGamers.main(AllGamers.java:61)
java objectinputstream objectoutputstream
java objectinputstream objectoutputstream
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
edited Feb 21 at 13:09
Kebab Programmer
1,02511328
1,02511328
asked Jan 2 at 11:10
WolF RamWolF Ram
62
asked Jan 2 at 11:10
WolF RamWolF Ram
62
asked Jan 2 at 11:10
WolF RamWolF Ram
62
62
5
I think that the problem is this:if(b = true){. Note that you have mistakenly used=instead of==. This means that you will be calling yourAppendingObjectOutputStreamevery time, and that (presumably) means there will be no valid stream header.
– Stephen C
Feb 21 at 12:22
And note thatif (b)is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.
– user207421
Feb 21 at 14:19
add a comment |
5
I think that the problem is this:if(b = true){. Note that you have mistakenly used=instead of==. This means that you will be calling yourAppendingObjectOutputStreamevery time, and that (presumably) means there will be no valid stream header.
– Stephen C
Feb 21 at 12:22
And note thatif (b)is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.
– user207421
Feb 21 at 14:19
5
5
I think that the problem is this:
if(b = true){. Note that you have mistakenly used = instead of ==. This means that you will be calling your AppendingObjectOutputStream every time, and that (presumably) means there will be no valid stream header.– Stephen C
Feb 21 at 12:22
I think that the problem is this:
if(b = true){. Note that you have mistakenly used = instead of ==. This means that you will be calling your AppendingObjectOutputStream every time, and that (presumably) means there will be no valid stream header.– Stephen C
Feb 21 at 12:22
And note that
if (b) is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.– user207421
Feb 21 at 14:19
And note that
if (b) is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.– user207421
Feb 21 at 14:19
add a comment |
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5
I think that the problem is this:
if(b = true){. Note that you have mistakenly used=instead of==. This means that you will be calling yourAppendingObjectOutputStreamevery time, and that (presumably) means there will be no valid stream header.– Stephen C
Feb 21 at 12:22
And note that
if (b)is simpler, more efficient, and cannot possibly have this problem. Don't compare booleans to true or false. They already are one or the other.– user207421
Feb 21 at 14:19