Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOfRange(Unknown Source)

Description

This error occurs when generating angular api from java spring swagger 2.0 to angular:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOfRange(Unknown Source)
at java.lang.String.(Unknown Source)
at java.lang.StringBuilder.toString(Unknown Source)
at com.fasterxml.jackson.core.util.TextBuffer.contentsAsString(TextBuffer.java:426)
at com.fasterxml.jackson.core.io.SegmentedStringWriter.getAndClear(SegmentedStringWriter.java:83)
at com.fasterxml.jackson.databind.ObjectWriter.writeValueAsString(ObjectWriter.java:1011)
at io.swagger.util.Json.pretty(Json.java:23)
at io.swagger.codegen.examples.ExampleGenerator.generate(ExampleGenerator.java:98)
at io.swagger.codegen.DefaultCodegen.getExamples(DefaultCodegen.java:3930)
at io.swagger.codegen.DefaultCodegen.fromOperation(DefaultCodegen.java:2345)
at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:912)
at io.swagger.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:842)
at io.swagger.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:459)
at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:778)
at io.swagger.codegen.cmd.Generate.run(Generate.java:299)
at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:35)

Swagger-codegen version

2.4.15-SNAPSHOT

Swagger declaration file content or url

error occurs while generating this model:

   "Activity": {
  "type": "object",
  "properties": {
    "attachments": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Attachment"
      }
    },
    "author": {
      "$ref": "#/definitions/User"
    },
    "bccContacts": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Contact"
      }
    },
    "bccIncomplete": {
      "type": "string"
    },
    "bccNames": {
      "type": "string"
    },
    "bccUsers": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/User"
      }
    },
    "bodyRTF": {
      "type": "string"
    },
    "bodyTXT": {
      "type": "string"
    },
    "calendarEvent": {
      "$ref": "#/definitions/CalendarEvent"
    },
    "ccContacts": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Contact"
      }
    },
    "ccIncomplete": {
      "type": "string"
    },
    "ccNames": {
      "type": "string"
    },
    "ccUsers": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/User"
      }
    },
    "companies": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Company"
      }
    },
    "createdBy": {
      "type": "string"
    },
    "createdDate": {
      "type": "string",
      "format": "date-time"
    },
    "creationDate": {
      "type": "string",
      "format": "date-time"
    },
    "cvStatus": {
      "$ref": "#/definitions/Keyword"
    },
    "deliveryMethod": {
      "$ref": "#/definitions/Keyword"
    },
    "forward": {
      "type": "boolean"
    },
    "hasIncompleteEmails": {
      "type": "boolean"
    },
    "id": {
      "type": "integer",
      "format": "int64"
    },
    "incomingCV": {
      "type": "boolean"
    },
    "incomingMessageId": {
      "type": "string"
    },
    "incompleteRecipient": {
      "type": "boolean"
    },
    "incompleteSender": {
      "type": "string"
    },
    "internalCode": {
      "type": "string"
    },
    "nextActionDate": {
      "type": "string",
      "format": "date-time"
    },
    "nextActionDateActionUser": {
      "type": "string"
    },
    "nextActionDescription": {
      "type": "string"
    },
    "nextActionType": {
      "$ref": "#/definitions/Keyword"
    },
    "nextActionUser": {
      "$ref": "#/definitions/User"
    },
    "notifyUsers": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/User"
      }
    },
    "opportunity": {
      "$ref": "#/definitions/Opportunity"
    },
    "order": {
      "$ref": "#/definitions/Order"
    },
    "otherContacts": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Contact"
      }
    },
    "owner": {
      "type": "string"
    },
    "phoneInitialization": {
      "type": "boolean"
    },
    "privateActivity": {
      "type": "boolean"
    },
    "profile": {
      "$ref": "#/definitions/Profile"
    },
    "project": {
      "$ref": "#/definitions/Project"
    },
    "recipients": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Contact"
      }
    },
    "recipientsIncomplete": {
      "type": "string"
    },
    "recipientsNames": {
      "type": "string"
    },
    "sendDate": {
      "type": "string",
      "format": "date-time"
    },
    "senderActivity": {
      "$ref": "#/definitions/Contact"
    },
    "status": {
      "$ref": "#/definitions/Keyword"
    },
    "subType": {
      "$ref": "#/definitions/Keyword"
    },
    "subject": {
      "type": "string"
    },
    "toReindex": {
      "type": "boolean"
    },
    "type": {
      "$ref": "#/definitions/Keyword"
    },
    "unresolvedEmails": {
      "type": "string"
    },
    "updatedBy": {
      "type": "string"
    },
    "updatedDate": {
      "type": "string",
      "format": "date-time"
    },
    "userRecipients": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/User"
      }
    },
    "uuid": {
      "type": "string"
    },
    "version": {
      "type": "integer",
      "format": "int64"
    },
    "visibleTo": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/User"
      }
    }
  }
}

Command line used for generation

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i http://localhost:8082/v2/api-docs -l typescript-angular -o c:/api-generated/

Steps to reproduce

run command java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i http://localhost:8082/v2/api-docs -l typescript-angular -o c:/api-generated/

Related issues/PRs

Suggest a fix/enhancement

Start by running the reported Java command with the supplied Swagger model and trace the failure through ExampleGenerator.java, DefaultCodegen.java, and Generate.java, as shown in the stack trace. Determine the scope of the heap exhaustion and verify that generation completes for this input without the reported OutOfMemoryError.