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How to use a #DynamoDBAttribute of Hashmap<String, #DynamoDBDocument>

I understand there may be cleaner ways to store these data, I'm skipping that part for the sake of my sanity in dealing with legacy code.
I want to store an object that looks like this in DynamoDB:
#DynamoDBTable(tableName="TableName")
public class MyItem {
// DynamoDB Attributes
private String hashKey;
private String someAttribute;
private Map<String, Config> configs;
#DynamoDBHashKey(attributeName = "hash_key")
public String getHashKey() {
return this.hashKey;
}
public void setHashKey(String hashKey) {
this.hashKey = hashKey;
}
#DynamoDBAttribute(attributeName = "some_attribute")
public String getSomeAttribute() {
return this.someAttribute;
}
public void setSomeAttribute(String someAttribute ) {
this.someAttribute = someAttribute;
}
#DynamoDBAttribute(attributeName = "configs")
public Map<String, Config> getConfigs() {
return this.configs;
}
public void setConfigs(Map<String, Config> configs)
{
this.configs = configs;
}
}
With a supplemental class
#DynamoDBDocument
public class Config {
private String field;
#DynamoDBAttribute(attributeName="field")
public String getField() {
return field;
}
public void setField(String field) {
this.field = field;
}
}
Will this work as written?
What would the resulting entry look like in DynamoDB for the following JSON:
{
"hash_key":"123",
"some_attribute":"attribute_value",
"a_config_key" : {
"field":"field_value"
}
}

I would recommend you to implement your own converter using #DynamoDbConvertedBy (the official dynamodb-enhanced client).
Hopefully, this sample is helpful: https://stackoverflow.com/a/70602166/12869305

SDN4 is not returning nested Entities

Hello Stack overflow,
I have the following Problem:
I have these entity classes:
public class UnknownEntity extends NetworkEntity{
#Id
#GeneratedValue(strategy = UuidStrategy.class)
private String id;
#Override
public void setId(String id) {
this.id = id;
}
#Override
public String getId() {
return id;
}
}
#NodeEntity
public class NetworkEntity {
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
#Id
protected String id;
public List<NetworkInterfaceEntity> getInterfaces() {
return interfaces;
}
public void setInterfaces(List<NetworkInterfaceEntity> interfaces) {
this.interfaces = interfaces;
}
#Relationship(type = "is_composed_of")
protected List<NetworkInterfaceEntity> interfaces ;
}
#NodeEntity
public class NetworkInterfaceEntity {
public String getInterfaceId() {
return interfaceId;
}
public void setInterfaceId(String interfaceId) {
this.interfaceId = interfaceId;
}
public String getIpAddress() {
return ipAddress;
}
public void setIpAddress(String ipAddress) {
this.ipAddress = ipAddress;
}
public String getNetmask() {
return netmask;
}
public void setNetmask(String netmask) {
this.netmask = netmask;
}
public String getMacAddress() {
return macAddress;
}
public void setMacAddress(String macAddress) {
this.macAddress = macAddress;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public InterfaceState getState() {
return state;
}
public void setState(InterfaceState state) {
this.state = state;
}
public List<NetworkInterfaceEntity> getSubInterfaces() {
return subInterfaces;
}
public void setSubInterfaces(List<NetworkInterfaceEntity> subInterfaces) {
this.subInterfaces = subInterfaces;
}
public long getBytesSent() {
return bytesSent;
}
public void setBytesSent(long bytesSent) {
this.bytesSent = bytesSent;
}
public long getBytesRecived() {
return bytesRecived;
}
public void setBytesRecived(long bytesRecived) {
this.bytesRecived = bytesRecived;
}
#Id
private String interfaceId;
private String ipAddress;
private String netmask;
private String macAddress;
private String name;
private InterfaceState state;
#Relationship(type = "is_composed_of")
private List<NetworkInterfaceEntity> subInterfaces;
private long bytesSent;
private long bytesRecived;
}
When I now try to query the UnknownEntities via a Neo4j Crud Repository with a custom #Query Method, the UnknownEntities wont be nested with the necessary NetworkInterfaceObjects, even tough my query returns these.
public interface UnknownEntityRepository extends CrudRepository<UnknownEntity,String> {
#Query("MATCH (u:UnknownEntity)-[:is_composed_of]->(i:NetworkInterfaceEntity) WHERE i.ipAddress IN {0} WITH u as unknown MATCH p=(unknown)-[r*0..1]-() RETURN collect(unknown),nodes(p),rels(p)")
List<UnknownEntity> searchMachinesByIp(List<String> ipAddresses);
}
In this particular case the NetworkInterfaceEntities do not contain more subInterfaces, so I only want the NetworkInterfaceEntities that belong the the UnknownEntity. But when I use this Query I only get UnknownEntities where the NetworkInterfaceList is null. I even tried different Querys to no avail for example:
"MATCH p=(u:UnknownEntitie)-[:is_composed_of]-(n:NetworkInterfaceEntity) WHERE n.ipAddress in {0} RETURN collect(n),nodes(p),rels(p)".
My Question is, if what I want is even possible with SDN4 Data and if it is, how I can achieve this, Since my alternative is to query the database for every NetworkInterface separately, which I think is really ugly.
Any help would be much appreciated.

please try if returning the full path like this:
public interface UnknownEntityRepository extends CrudRepository<UnknownEntity,String> {
#Query("MATCH (u:UnknownEntity)-[:is_composed_of]->(i:NetworkInterfaceEntity) WHERE i.ipAddress IN {0} WITH u as unknown MATCH p=(unknown)-[r*0..1]-() RETURN p")
List<UnknownEntity> searchMachinesByIp(List<String> ipAddresses);
}
works for your. If not, try naming the objects in question, i.e. RETURN i as subInterfaces works for you.
Are you using Spring Data Neo4j 4 or 5? If you're on 4, consider the upgrade to 5 to be on a supported level.
Please let me know, if this helps.

How to convert Java objects to XML element attributes using JAXB

How to convert java object to xml using JAXB to get the following xml:
<Case>
<Version>1.0</Version>
<Code>457123</Code>
<Meta uc=\"Sample\" pip=\"116.0.1.1\" lot=\"P\"/>
</Case>
There are many answers regarding how to get XML. I have gone through all those. But my question is how to get the XML as what I have shown. It contains a self-closing tag which even contains attributes.
I am using Eclipse IDE. Please suggest a method.
This is my case class:
import auth.Res.Meta;
#XmlRootElement (name="Case")
public class Test {
private Meta mt;
private String version;
private String code;
#XmlRootElement
public class Meta {
#XmlAttribute
private String uc;
#XmlAttribute
private String pip;
public String getUc() {
return uc;
}
public void setUc(String uc) {
this.uc = uc;
}
public String getPip() {
return pip;
}
public void setPip(String pip) {
this.pip = pip;
}
}
public Meta getMt() {
return mt;
}
public void setMt(Meta mt) {
this.mt = mt;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
}
Solution:
I solved it by creating seperate class for Meta as suggested by LazerBanana in the first answer.

This is how your Meta class should look like.
public class Meta {
private String uc;
private String pip;
private String lot;
public String getUc() {
return uc;
}
#XmlAttribute
public void setUc(String uc) {
this.uc = uc;
}
public String getPip() {
return pip;
}
#XmlAttribute
public void setPip(String pip) {
this.pip = pip;
}
public String getLot() {
return lot;
}
#XmlAttribute
public void setLot(String lot) {
this.lot = lot;
}
}
this is your Case class which is the root element
#XmlRootElement
public class Case {
private int version;
private String code;
private String id;
private Meta meta;
public int getVersion() {
return version;
}
#XmlElement
public void setVersion(int version) {
this.version = version;
}
public String getCode() {
return code;
}
#XmlElement
public void setCode(String code) {
this.code = code;
}
public String getId() {
return id;
}
#XmlElement
public void setId(String id) {
this.id = id;
}
public Meta getMeta() {
return meta;
}
#XmlElement
public void setMeta(Meta meta) {
this.meta = meta;
}
}
And this is the marshaling bit to the console and to the file it you want.
public class Main {
public static void main(String... args) {
Case fcase = new Case();
Meta meta = new Meta();
meta.setLot("asd");
meta.setPip("sdafa");
meta.setUc("asgd4");
fcase.setMeta(meta);
fcase.setVersion(1);
fcase.setId("sah34");
fcase.setCode("code34");
try {
// File file = new File("C:\\file.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(Case.class, Meta.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
// jaxbMarshaller.marshal(fcase, file);
jaxbMarshaller.marshal(fcase, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
Output:
<case>
<code>code34</code>
<id>sah34</id>
<meta lot="asd" pip="sdafa" uc="asgd4"/>
<version>1</version>
</case>
Next time please try to do more research i am not an expert and I just googled it.
https://www.mkyong.com/java/jaxb-hello-world-example/

i need to create a rest service which accepts xml of format i have gien. Thats y i need it in a single class.
#POST
#Path("/add")
#Consumes("application/xml")
#Produces("application/xml")
public Response getper(Test test)
{
String nam=test.getVersion();
int cd=test.getCode();
Res rs=new Res();
rs.setMessage(nam);
.
.
return Response.status(200).entity(rs).build();
}

Assign one json value for two fields in java using GSON

I am trying to assign the value returned by some function to a field in the deserialized class of json.
FileInfo.java
public class FileInfo {
#SerializedName("Name")
private String mName;
#SerializedName("Url")
private String mUri;
#SerializedName("Size")
private Integer mSize;
#SerializedName("ModTime")
private Long mModifiedTime;
private FileType mType;
#SerializedName("Children")
private ArrayList<FileInfo> mChildren = new ArrayList<>();
public ArrayList<FileInfo> getChildren() {
return mChildren;
}
public long getModifiedTime() {
return mModifiedTime;
}
public String getName() {
return mName;
}
public Integer getSize() {
return mSize;
}
public String getUrl() {
return mUri;
}
public FileType getType() {
return mType;
}
public void setChildren(ArrayList<FileInfo> mChildren) {
this.mChildren = mChildren;
}
public void setModifiedTime(long mModifiedTime) {
this.mModifiedTime = mModifiedTime;
}
public void setName(String mName) {
this.mName = mName;
}
public void setSize(Integer mSize) {
this.mSize = mSize;
}
public void setType(FileType mType) {
this.mType = mType;
}
public void setUri(String mUri) {
this.mUri = mUri;
}
#Override
public String toString() {
return FileInfo.class.toString();
}
public FileInfo() {
}
}
The mType needs to be assigned to foo(mName). I looked up custom deserializers and instance creators but none of those helped. I also thought of TypeAdapters which i feel defeats the purpose of keeping deserialization(using GSON) simple.
This is a sample JSON string that will be deserialized.
[
{
"Name":"Airport",
"Url":"http://192.168.2.2/api/sites/Baltimore%20Airport/Airport",
"Size":0,
"ModTime":"2015-12-02T14:19:17.29824-05:00",
"Children":null
}
]
P.S. I'm not sure if this should be done during deserialization but trying anyways. Also please let me know of alternative ways to achieve this.

Pulling XML child inner node from XML to Java Object using JAXB

I have been trying to pull a child node from an XML which I received from a SOAP as string. I can retrieve the parent node but couldn't retrieve the child node. I also surf the internet to see if I can get an answer but all to no avail. I saw some examples with direct child pulling, but that didn't solve my problem.
<response>
<code>1</code>
<list available="2">
<cart id="2" name="egg">
<stuff>
<id>001</id>
<name>Crew</name>
<shortname>C</shortname>
</stuff>
</cart>
<cart id="4" name="bread">
<stuff>
<id>004</id>
<name>Bread</name>
<shortname>B</shortname>
</stuff>
</cart>
</list>
</response>
Response Class
public class Response {
private String code;
private String list;
private String cart;
private Response.Stuff stuffs;
#XmlElement(name="code")
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
.
.
#XmlElement
public Response.Stuff getStuff() {
return this.stuffs;
}
public void setStuff(Response.Cart stuff) {
this.stuffs = stuff;
}
public static class Stuff {
private List<Stuff> stuff;
public List<Stuff> getStuff() {
if (stuff == null) {
stuff = new ArrayList<Stuff>();
}
return stuff;
}
}
}
Stuff Classs
public class Stuff {
private String id;
private String crew;
#XmlElement
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
.
.
}
Now my problem is how to pull child stuff content (i.e id,name and shortname) using JAXB.
I created class Response and Stuff and made stuff a list inside response but when ever I run the code it throws null exception.
PS: Please remember the XML is not a file its a string and am using StringReader class for the JAXB.unmarshal

JAXBContext jcontext= JAXBContext.newInstance();
unmarshaller um=jcontext.createUnmarshaller();
JAXBElement je=um.unmarshal(new File("pass xml file location"));
response r= getValue();
r.getlist().getcart().getstuff().getid().getValue();
try this one it may work

I finally solved my problem by restructuring the above class and creating a new one. See below the updated:
public class Response {
private String code;
private List list;
#XmlElement(name="code")
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
#XmlElement(name= "list")
public List getlist() {
return this.list;
}
public void setList(List list) {
this.list = list;
}
}
Class List
#XmlRootElement(name= "list")
public class List {
private List.Cart cart;
#XmlElement(name= "cart")
public List<Cart> getCart() {
return this.cart;
}
public void setCart(Cart cart) {
this.cart = cart;
}
#XmlRootElement(name= "cart")
public static class Cart {
private List<Stuff> stuff;
private List<Stuff> getStuff() {
if (stuff == null) {
stuff = new ArrayList();
}
return stuff;
}
}
}
With this, it was easy for me to marshal and unmarshal