Spring Batch: SingleItemPeekableItemReader not working some times
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I am trying to use SingleItemPeekableItemReader to read multiline data. This sometimes did not work and there is no error thrown. While debugging it just shows reader.peek() is null. What am i missing here?
Xml File snippet:
< bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
...
< /bean>
< bean id="itemReaderB" class="org.springframework.batch.item.support.SingleItemPeekableItemReader" scope="step">
< property name="delegate" ref="itemReaderA"/>
< /bean>
< bean id="TransactionFileReader" class="<customReader class>" scope="step">
< property name="delegate" ref="itemReaderB"/>
< /bean>
Read method/Class
public class customReader implements ItemReader<ELCTransactionHeader>, ItemStream {
SingleItemPeekableItemReader<ElcHKTransactionFileDatabean> delegate;
public CustomBEan read() throws Exception, ParseException, NonTransientResourceException {
InputBEan line = null;
InputBEan prevElement = null;
boolean exit = false;
CustomBEan transactionObj = null;
while (!exit && (line = (InputBEan) this.delegate.peek()) != null) {
if ((prevElement == null ) || (prevElement != null && line.getInvoiceNumber().equals(prevElement.getInvoiceNumber()))) {
System.out.println("Part of same txn or beginning of new txn");
delegate.read();
transactionObj = processLine(transactionObj , line);
prevElement = line;
} else {
System.out.println("Different txn");
exit = true;
}
}
return transactionObj;
}
spring-batch
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
add a comment |
0
I am trying to use SingleItemPeekableItemReader to read multiline data. This sometimes did not work and there is no error thrown. While debugging it just shows reader.peek() is null. What am i missing here?
Xml File snippet:
< bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
...
< /bean>
< bean id="itemReaderB" class="org.springframework.batch.item.support.SingleItemPeekableItemReader" scope="step">
< property name="delegate" ref="itemReaderA"/>
< /bean>
< bean id="TransactionFileReader" class="<customReader class>" scope="step">
< property name="delegate" ref="itemReaderB"/>
< /bean>
Read method/Class
public class customReader implements ItemReader<ELCTransactionHeader>, ItemStream {
SingleItemPeekableItemReader<ElcHKTransactionFileDatabean> delegate;
public CustomBEan read() throws Exception, ParseException, NonTransientResourceException {
InputBEan line = null;
InputBEan prevElement = null;
boolean exit = false;
CustomBEan transactionObj = null;
while (!exit && (line = (InputBEan) this.delegate.peek()) != null) {
if ((prevElement == null ) || (prevElement != null && line.getInvoiceNumber().equals(prevElement.getInvoiceNumber()))) {
System.out.println("Part of same txn or beginning of new txn");
delegate.read();
transactionObj = processLine(transactionObj , line);
prevElement = line;
} else {
System.out.println("Different txn");
exit = true;
}
}
return transactionObj;
}
spring-batch
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
not working some timesCan you isolate this behaviour to only theSingleItemPeekableItemReader? I see it used as a delegate in a custom reader.
– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24
add a comment |
0
0
0
I am trying to use SingleItemPeekableItemReader to read multiline data. This sometimes did not work and there is no error thrown. While debugging it just shows reader.peek() is null. What am i missing here?
Xml File snippet:
< bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
...
< /bean>
< bean id="itemReaderB" class="org.springframework.batch.item.support.SingleItemPeekableItemReader" scope="step">
< property name="delegate" ref="itemReaderA"/>
< /bean>
< bean id="TransactionFileReader" class="<customReader class>" scope="step">
< property name="delegate" ref="itemReaderB"/>
< /bean>
Read method/Class
public class customReader implements ItemReader<ELCTransactionHeader>, ItemStream {
SingleItemPeekableItemReader<ElcHKTransactionFileDatabean> delegate;
public CustomBEan read() throws Exception, ParseException, NonTransientResourceException {
InputBEan line = null;
InputBEan prevElement = null;
boolean exit = false;
CustomBEan transactionObj = null;
while (!exit && (line = (InputBEan) this.delegate.peek()) != null) {
if ((prevElement == null ) || (prevElement != null && line.getInvoiceNumber().equals(prevElement.getInvoiceNumber()))) {
System.out.println("Part of same txn or beginning of new txn");
delegate.read();
transactionObj = processLine(transactionObj , line);
prevElement = line;
} else {
System.out.println("Different txn");
exit = true;
}
}
return transactionObj;
}
spring-batch
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
I am trying to use SingleItemPeekableItemReader to read multiline data. This sometimes did not work and there is no error thrown. While debugging it just shows reader.peek() is null. What am i missing here?
Xml File snippet:
< bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
...
< /bean>
< bean id="itemReaderB" class="org.springframework.batch.item.support.SingleItemPeekableItemReader" scope="step">
< property name="delegate" ref="itemReaderA"/>
< /bean>
< bean id="TransactionFileReader" class="<customReader class>" scope="step">
< property name="delegate" ref="itemReaderB"/>
< /bean>
Read method/Class
public class customReader implements ItemReader<ELCTransactionHeader>, ItemStream {
SingleItemPeekableItemReader<ElcHKTransactionFileDatabean> delegate;
public CustomBEan read() throws Exception, ParseException, NonTransientResourceException {
InputBEan line = null;
InputBEan prevElement = null;
boolean exit = false;
CustomBEan transactionObj = null;
while (!exit && (line = (InputBEan) this.delegate.peek()) != null) {
if ((prevElement == null ) || (prevElement != null && line.getInvoiceNumber().equals(prevElement.getInvoiceNumber()))) {
System.out.println("Part of same txn or beginning of new txn");
delegate.read();
transactionObj = processLine(transactionObj , line);
prevElement = line;
} else {
System.out.println("Different txn");
exit = true;
}
}
return transactionObj;
}
spring-batch
spring-batch
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
edited Nov 26 '18 at 14:44
Dmitriy Fialkovskiy
1,63751627
1,63751627
asked Nov 26 '18 at 11:16
ArunaAruna
1
asked Nov 26 '18 at 11:16
ArunaAruna
1
asked Nov 26 '18 at 11:16
ArunaAruna
1
1
not working some timesCan you isolate this behaviour to only theSingleItemPeekableItemReader? I see it used as a delegate in a custom reader.
– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24
add a comment |
not working some timesCan you isolate this behaviour to only theSingleItemPeekableItemReader? I see it used as a delegate in a custom reader.
– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24
not working some times Can you isolate this behaviour to only the SingleItemPeekableItemReader? I see it used as a delegate in a custom reader.– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
not working some times Can you isolate this behaviour to only the SingleItemPeekableItemReader? I see it used as a delegate in a custom reader.– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24
add a comment |
0
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not working some timesCan you isolate this behaviour to only theSingleItemPeekableItemReader? I see it used as a delegate in a custom reader.– Mahmoud Ben Hassine
Nov 26 '18 at 13:21
Yes... I debugged this. N line which is returning null is this.delegate.peek().
– Aruna
Nov 26 '18 at 14:39
ok great, in that case can you provide a unit test that "some times" fails? I will try to help on that.
– Mahmoud Ben Hassine
Nov 26 '18 at 15:40
Sorry, I did not have time to write unit test case as of now..But for me isue is resolved with below code n configuration. Just curious whether if we call peek method first makes difference? < bean id="itemReaderA" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"> ... < /bean> < bean id="TransactionFileReader" class="<customReader class>" scope="step"> < property name="delegate" ref="itemReaderA"/> < /bean>
– Aruna
Nov 29 '18 at 5:25
My Custom reader extends SingleItemPeekableItemReader and it calls read method first rather than calling peek method
– Aruna
Nov 29 '18 at 7:24