Hibernate - Query Result contains null and throws expection - spring

Question

I have two tables, TBL_MARKET_WATCH_NAME (Master) and TBL_MARKET_WATCH (Details) connected through an MW_ID column in MySQL. I'm using hibernate and doing a LEFT JOIN on these two tables to fetch data. Most of the time the Details table may not have data for the connecting ID column from left table which results in null values in resultset.
Master table is defined as
#Entity(name = "TBL_MARKET_WATCH_NAME")
#Id
#GeneratedValue
#Column(name = "ID")
private Long id;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumn(name = "MW_ID")
private List<MarketWatchScripDetailsDTO> mwDetailsDTO;
#Column(name = "MW_ID")
private Integer mwId;
#Column(name = "USER_ID")
private String userId;
#Column(name = "MW_NAME")
private String mwName;
The Details table is defined as below
#Entity(name = "TBL_MARKET_WATCH")
#Id
#GeneratedValue
#Column(name = "ID")
private Long id;
#Column(name = "USER_ID")
private String userId;
#Column(name = "MW_ID")
private Integer mwId;
#Column(name = "SCRIP_NAME")
private String scripName;
In Master table, I have data like below
In Details table, I have data as below
I have a left join query running on Hibernate as below
#Transactional
#Query(value = "SELECT A.mwName as mwName, B.userId as userId, B.mwId as mwId, B.scripName as scripName FROM TBL_MARKET_WATCH_NAME as A LEFT JOIN A.mwDetailsDTO B on A.mwId = B.mwId and A.userId = B.userId where A.userId = :pUserId")
When running the query and converting it into an object my resultset is as below
List<Object> getUserScripDetailsNew(#Param("pUserId") String pUserId);
[
"LIST0",
"650156",
1,
"NATURALGAS 26OCT22 FUT",
],
.... <***some more data***>
[
"LIST2",
null,
null,
null
]
Instead of List if I use model interface like the one defined below, I'm getting null pointer exception because it is not able to convert null values to integer.
List<MwTblResponseModel> getUserScripDetailsNew(#Param("pUserId") String pUserId);
public interface MwTblResponseModel {
public String getMwName();
public String getUserId();
public Integer getMwId();
public String getScripName();
}
The error is as below.
java.lang.NullPointerException
at in.codifi.marketwatch.model.MwTblResponseModel_e3fe8bfde9ba7f8b10664ce55c6c5ef842396ab4.convert_getUserScripDetailsNew(Unknown Source)
at in.codifi.marketwatch.dao.repos.MarketWatchNameRepository_486524f74fd05ac96e0dcf8fffaa2af5a4b95b43Impl$$function$$1.apply(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at org.hibernate.query.spi.StreamDecorator.collect(StreamDecorator.java:209)
at in.codifi.marketwatch.dao.repos.MarketWatchNameRepository_486524f74fd05ac96e0dcf8fffaa2af5a4b95b43Impl.getUserScripDetailsNew(Unknown Source)
at in.codifi.marketwatch.dao.repos.MarketWatchNameRepository_486524f74fd05ac96e0dcf8fffaa2af5a4b95b43Impl_Subclass.getUserScripDetailsNew$$superforward1(Unknown Source)
at in.codifi.marketwatch.dao.repos.MarketWatchNameRepository_486524f74fd05ac96e0dcf8fffaa2af5a4b95b43Impl_Subclass$$function$$8.apply(Unknown Source)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:53)
at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.proceed(InvocationInterceptor.java:62)
at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.monitor(InvocationInterceptor.java:49)
at io.quarkus.arc.runtime.devconsole.InvocationInterceptor_Bean.intercept(Unknown Source)
at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:40)
at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
at in.codifi.marketwatch.dao.repos.MarketWatchNameRepository_486524f74fd05ac96e0dcf8fffaa2af5a4b95b43Impl_Subclass.getUserScripDetailsNew(Unknown Source)
How to make sure when null values are coming from Query to assign 0 in final response?