techprimers / spring-batch-example-1

Spring Boot with Spring Batch Example 1 (Load CSV to DB)

Spring Boot with Spring Batch Example 1

Load CSV to DB

• http://localhost:8081/load - Trigger point for Spring Batch
• http://localhost:8081/h2-console - H2 Console for querying the in-memory tables.

H2 Config

• testdb - Database.
• sa - User
• password - Password.

spring-batch-example-1's Issues

Some sort of error

Exception in thread "main" java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
at org.springframework.boot.devtools.restart.DefaultRestartInitializer.getUrls(DefaultRestartInitializer.java:93)
at org.springframework.boot.devtools.restart.DefaultRestartInitializer.getInitialUrls(DefaultRestartInitializer.java:56)
at org.springframework.boot.devtools.restart.Restarter.(Restarter.java:140)
at org.springframework.boot.devtools.restart.Restarter.initialize(Restarter.java:583)
at org.springframework.boot.devtools.restart.RestartApplicationListener.onApplicationStartingEvent(RestartApplicationListener.java:67)
at org.springframework.boot.devtools.restart.RestartApplicationListener.onApplicationEvent(RestartApplicationListener.java:45)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)
at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
at com.techprimers.springbatchexample1.SpringBatchExample1Application.main(SpringBatchExample1Application.java:10)

Process finished with exit code 1

Not creating tables in h2

application is running fine but not creating tables in the h2 dev tools.
please help

Failed to initialize the reader

Encountered an error executing step ETL-file-load in job ETL-Load

failed to run

failed to run job schedular

Error while running the source code

Hi TechPrimers,
Thanks for your code share, I have couple of queries, answering my queries will be appreciated.

1. We noticed the error as below with given code base, Please take a look:
   Caused by: java.lang.IllegalStateException: Input resource must exist (reader is in 'strict' mode): URL [file:/Users/apple/Downloads/spring-batch-example-1/src/main/resources/users.csv]
   at org.springframework.batch.item.file.FlatFileItemReader.doOpen(FlatFileItemReader.java:251) ~[spring-batch-infrastructure-3.0.9.RELEASE.jar:3.0.9.RELEASE]
   at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:144) ~[spring-batch-infrastructure-3.0.9.RELEASE.jar:3.0.9.RELEASE]... 76 common frames omitted

2.Currently I am running this application by hardcording the resource input, and its runnign as expected, But how can I run this application to pick the source file((~5 millions records) from shared drive location, instead of pickign from resource folder, What changes are required for it?

3.What are the changes required to switch it to other data sources(sql server). ?
Please suggest the code changes, thanks in advance.