guidewire-migration-deep-dive

name	guidewire-migration-deep-dive
description	Deep dive into Guidewire migration strategies including self-managed to Cloud, legacy system migrations, data migration, and integration cutover planning. Trigger with phrases like "guidewire migration", "cloud migration", "legacy migration", "data migration guidewire", "cutover planning".
allowed-tools	Read, Write, Edit, Bash(curl:*), Bash(gradle:*), Grep
version	1.0.0
license	MIT
author	Jeremy Longshore <[e-mail]>

Guidewire Migration Deep Dive

Overview

Comprehensive guide for Guidewire migrations including self-managed to Cloud migrations, legacy system replacements, data migrations, and integration cutover strategies.

Prerequisites

• Understanding of current system architecture
• Access to source and target environments
• Stakeholder alignment on migration scope
• Detailed inventory of customizations

Migration Types

Migration Type	Description	Complexity	Timeline
Version Upgrade	Same platform, new version	Low-Medium	3-6 months
Cloud Migration	Self-managed to Guidewire Cloud	Medium-High	6-12 months
Platform Replacement	Legacy to Guidewire	High	12-24 months
Consolidation	Multiple systems to one	High	12-18 months

Migration Phases

┌─────────────────────────────────────────────────────────────────────────────────┐
│                          Migration Lifecycle                                     │
├─────────────────────────────────────────────────────────────────────────────────┤
│                                                                                  │
│  Phase 1        Phase 2        Phase 3        Phase 4        Phase 5           │
│  ┌─────────┐   ┌─────────┐   ┌─────────┐   ┌─────────┐   ┌─────────┐          │
│  │ ASSESS  │──▶│ PLAN    │──▶│ BUILD   │──▶│ MIGRATE │──▶│OPTIMIZE │          │
│  │         │   │         │   │         │   │         │   │         │          │
│  │ 4-6 wks │   │ 4-8 wks │   │12-20 wks│   │ 4-8 wks │   │ 8-12 wks│          │
│  └─────────┘   └─────────┘   └─────────┘   └─────────┘   └─────────┘          │
│       │             │             │             │             │                 │
│       ▼             ▼             ▼             ▼             ▼                 │
│  • Discovery    • Roadmap     • Config      • Data        • Performance       │
│  • Inventory    • Resources   • Testing     • Cutover     • Tuning            │
│  • Risk         • Timeline    • Integration • Validation  • Documentation     │
│                                                                                  │
└─────────────────────────────────────────────────────────────────────────────────┘

Instructions

Step 1: Assessment and Discovery

// Migration assessment framework
interface AssessmentResult {
  customizations: CustomizationInventory;
  integrations: IntegrationInventory;
  dataVolume: DataVolumeAnalysis;
  risks: Risk[];
  recommendations: Recommendation[];
}

interface CustomizationInventory {
  gosuFiles: number;
  pcfFiles: number;
  entityExtensions: number;
  plugins: number;
  customRules: number;
  estimatedEffort: string;
}

class MigrationAssessment {
  async assess(sourceEnvironment: string): Promise<AssessmentResult> {
    console.log('Starting migration assessment...');

    const customizations = await this.inventoryCustomizations(sourceEnvironment);
    const integrations = await this.inventoryIntegrations(sourceEnvironment);
    const dataVolume = await this.(sourceEnvironment);
     risks = .(customizations, integrations, dataVolume);
     recommendations = .(risks);

     {
      customizations,
      integrations,
      dataVolume,
      risks,
      recommendations
    };
  }

    (: ): <> {
    
     gosuFiles =  .(env, );
     pcfFiles =  .(env, );
     entityExtensions =  .(env, );
     plugins =  .(env);
     customRules =  .(env);

     estimatedEffort = .(
      gosuFiles, pcfFiles, entityExtensions, plugins, customRules
    );

     {
      gosuFiles,
      pcfFiles,
      entityExtensions,
      plugins,
      customRules,
      estimatedEffort
    };
  }

    (: ): <> {
     {
      :  .(env),
      :  .(env),
      :  .(env),
      :  .(env)
    };
  }

   (
    : ,
    : ,
    : 
  ): [] {
     : [] = [];

    
     (customizations. > ) {
      risks.({
        : ,
        : ,
        : ,
        : 
      });
    }

    
     (integrations. > ) {
      risks.({
        : ,
        : ,
        : ,
        : 
      });
    }

    
     (dataVolume. > ) {
      risks.({
        : ,
        : ,
        : ,
        : 
      });
    }

     risks;
  }
}

Step 2: Data Migration Planning

// Data migration strategy
interface DataMigrationPlan {
  phases: MigrationPhase[];
  totalRecords: number;
  estimatedDuration: string;
  rollbackStrategy: RollbackStrategy;
}

interface MigrationPhase {
  name: string;
  entities: EntityMigration[];
  sequence: number;
  dependencies: string[];
  estimatedDuration: string;
}

interface EntityMigration {
  sourceEntity: string;
  targetEntity: string;
  recordCount: number;
  transformations: Transformation[];
  validations: Validation[];
}

class DataMigrationPlanner {
  createPlan(assessment: AssessmentResult): DataMigrationPlan {
    // Define migration phases based on dependencies
    const phases: MigrationPhase[] = [
      {
        name: 'Reference Data',
        sequence: 1,
        dependencies: [],
        : ,
        : [
          { : , : , : , : [], : [] },
          { : , : , : , : [], : [] },
          { : , : , : , : [], : [] }
        ]
      },
      {
        : ,
        : ,
        : [],
        : ,
        : [
          { : , : , : , : [.()], : [.()] },
          { : , : , : , : [], : [] }
        ]
      },
      {
        : ,
        : ,
        : [],
        : ,
        : [
          { : , : , : , : [.()], : [.()] },
          { : , : , : , : [], : [] }
        ]
      },
      {
        : ,
        : ,
        : [],
        : ,
        : [
          { : , : , : , : [.()], : [.()] },
          { : , : , : , : [], : [] }
        ]
      }
    ];

     {
      phases,
      : .(phases),
      : ,
      : .(phases)
    };
  }

   ():  {
     {
      : ,
      : [
        { : , :  },
        { : , :  },
        { : , :  }
      ]
    };
  }

   ():  {
     {
      : ,
      : [
        { : , :  },
        { : , :  },
        { : , :  }
      ]
    };
  }
}

Step 3: Data Migration Execution

// Data migration executor
package gw.migration.data

uses gw.api.database.Query
uses gw.api.util.Logger
uses gw.transaction.Transaction
uses java.sql.Connection
uses java.sql.PreparedStatement

class DataMigrationExecutor {
  private static final var LOG = Logger.forCategory("DataMigration")
  private static final var BATCH_SIZE = 500

  // Migrate accounts from legacy system
  static function migrateAccounts(sourceConnection : Connection) : MigrationResult {
    var result = new MigrationResult("accounts")
    var selectStmt = sourceConnection.prepareStatement(
      "SELECT * FROM legacy_accounts WHERE migration_status = 'pending' ORDER BY created_date"
    )

    var rs = selectStmt.executeQuery()
    var batch = new ArrayList<LegacyAccount>()

    while (rs.next()) {
      batch.add(mapLegacyAccount(rs))

      if (batch.size() >= BATCH_SIZE) {
        processBatch(batch, result)
        batch.clear()
      }
    }

    // Process remaining
    if (!batch.Empty) {
      processBatch(batch, result)
    }

    rs.close()
    selectStmt.close()

    LOG.info("Account migration complete: ${result.Succeeded} succeeded, ${result.Failed} failed")
    return result
  }

  private static function processBatch(batch : List<LegacyAccount>, result : MigrationResult) {
    Transaction.runWithNewBundle(\bundle -> {
      batch.each(\legacy -> {
        try {
          // Check if already migrated
          var existing = Query.make(Account)
            .compare(Account#LegacyID_Ext, Equals, legacy.LegacyId)
            .select()
            .AtMostOneRow

          if (existing != null) {
            LOG.debug("Account already migrated: ${legacy.LegacyId}")
            result.incrementSkipped()
            return
          }

          // Create new account
          var account = createAccount(bundle, legacy)

          // Validate
          var validation = validateAccount(account)
          if (validation.HasErrors) {
            LOG.warn("Validation failed for ${legacy.LegacyId}: ${validation.Errors}")
            result.addError(legacy.LegacyId, validation.toString())
            result.incrementFailed()
            return
          }

          result.incrementSucceeded()
        } catch (e : Exception) {
          LOG.error("Migration failed for ${legacy.LegacyId}", e)
          result.addError(legacy.LegacyId, e.Message)
          result.incrementFailed()
        }
      })
    })
  }

  private static function createAccount(bundle : Bundle, legacy : LegacyAccount) : Account {
    var account = new Account(bundle)
    account.AccountNumber = generateAccountNumber(legacy)
    account.LegacyID_Ext = legacy.LegacyId

    // Create contact
    var contact : Contact
    if (legacy.IsCompany) {
      var company = new Company(bundle)
      company.Name = legacy.CompanyName
      company.FEINOfficialID = legacy.FEIN
      contact = company
    } else {
      var person = new Person(bundle)
      person.FirstName = legacy.FirstName
      person.LastName = legacy.LastName
      person.DateOfBirth = legacy.DateOfBirth
      contact = person
    }

    contact.EmailAddress1 = legacy.Email
    contact.HomePhone = legacy.Phone

    // Create address
    var address = new Address(bundle)
    address.AddressLine1 = legacy.Address1
    address.AddressLine2 = legacy.Address2
    address.City = legacy.City
    address.State = mapState(legacy.State)
    address.PostalCode = legacy.Zip
    address.Country = Country.TC_US
    contact.PrimaryAddress = address

    account.AccountHolderContact = contact

    return account
  }
}

Step 4: Integration Cutover Planning

// Integration cutover strategy
interface CutoverPlan {
  phases: CutoverPhase[];
  rollbackPoints: RollbackPoint[];
  communicationPlan: CommunicationPlan;
  goNoGoChecklist: ChecklistItem[];
}

interface CutoverPhase {
  name: string;
  startTime: Date;
  duration: string;
  tasks: CutoverTask[];
  verificationSteps: VerificationStep[];
}

class CutoverPlanner {
  createPlan(targetDate: Date): CutoverPlan {
    const phases: CutoverPhase[] = [
      {
        name: 'Pre-Cutover (T-24 hours)',
        startTime: new Date(targetDate.getTime() - 24 * 60 * 60 * 1000),
        duration: '24 hours',
        tasks: [
          { name: 'Final data sync', owner: 'Data Team', duration: '4 hours' },
          { : , : , :  },
          { : , : , :  },
          { : , : , :  }
        ],
        : [
          { : , :  },
          { : , :  }
        ]
      },
      {
        : ,
        : targetDate,
        : ,
        : [
          { : , : , :  },
          { : , : , :  },
          { : , : , :  },
          { : , : , :  },
          { : , : , :  }
        ],
        : [
          { : , :  },
          { : , :  },
          { : , :  }
        ]
      },
      {
        : ,
        :  (targetDate.() +  *  *  * ),
        : ,
        : [
          { : , : , :  },
          { : , : , :  },
          { : , : , :  },
          { : , : , :  }
        ],
        : [
          { : , :  },
          { : , :  },
          { : , :  }
        ]
      }
    ];

     {
      phases,
      : .(phases),
      : .(),
      : .()
    };
  }

   (: []): [] {
     [
      {
        : ,
        : ,
        : ,
        : 
      },
      {
        : ,
        : ,
        : ,
        : 
      },
      {
        : ,
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      }
    ];
  }

   (): [] {
     [
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      { : , : , :  },
      { : , : , :  },
      { : , : , :  },
      { : , : , :  },
      { : , : , :  }
    ];
  }
}

Step 5: Validation Framework

// Post-migration validation
package gw.migration.validation

uses gw.api.database.Query
uses gw.api.util.Logger

class MigrationValidator {
  private static final var LOG = Logger.forCategory("MigrationValidator")

  static function validateMigration() : ValidationReport {
    var report = new ValidationReport()

    // Record count validation
    report.addSection("Record Counts", validateRecordCounts())

    // Data integrity validation
    report.addSection("Data Integrity", validateDataIntegrity())

    // Business rule validation
    report.addSection("Business Rules", validateBusinessRules())

    // Financial reconciliation
    report.addSection("Financial Reconciliation", validateFinancials())

    return report
  }

  private static function validateRecordCounts() : List<ValidationResult> {
    var results = new ArrayList<ValidationResult>()

    // Compare counts with source
    var sourceCounts = getSourceCounts()
    var targetCounts = getTargetCounts()

    sourceCounts.eachKeyAndValue(\entity, sourceCount -> {
      var targetCount = targetCounts.get(entity) ?: 0
      var variance = Math.abs(sourceCount - targetCount)
      var variancePercent = (variance * 100.0 / sourceCount)

      var result = new ValidationResult()
      result.Check = "Record count: ${entity}"
      result.Expected = sourceCount.toString()
      result.Actual = targetCount.toString()
      result.Passed = variancePercent < 0.1  // Allow 0.1% variance

      if (!result.Passed) {
        result.Message = "Variance of ${variancePercent}% exceeds threshold"
      }

      results.add(result)
    })

    return results
  }

  private static function validateDataIntegrity() : List<ValidationResult> {
    var results = new ArrayList<ValidationResult>()

    // Check for orphan records
    var orphanPolicies = Query.make(Policy)
      .compare(Policy#Account, Equals, null)
      .select()
      .Count

    results.add(new ValidationResult() {
      :Check = "Orphan policies",
      :Expected = "0",
      :Actual = orphanPolicies.toString(),
      :Passed = orphanPolicies == 0,
      :Message = orphanPolicies > 0 ? "Found ${orphanPolicies} policies without accounts" : null
    })

    // Check for duplicate records
    var duplicateAccounts = findDuplicateAccounts()
    results.add(new ValidationResult() {
      :Check = "Duplicate accounts",
      :Expected = "0",
      :Actual = duplicateAccounts.Count.toString(),
      :Passed = duplicateAccounts.Empty,
      :Message = !duplicateAccounts.Empty ? "Found ${duplicateAccounts.Count} duplicate accounts" : null
    })

    return results
  }

  private static function validateFinancials() : List<ValidationResult> {
    var results = new ArrayList<ValidationResult>()

    // Total written premium reconciliation
    var sourcePremium = getSourceTotalPremium()
    var targetPremium = Query.make(Policy)
      .select()
      .sum(\p -> p.TotalPremiumRPT.Amount)

    var variance = Math.abs(sourcePremium - targetPremium)
    var variancePercent = (variance * 100.0 / sourcePremium)

    results.add(new ValidationResult() {
      :Check = "Total written premium",
      :Expected = sourcePremium.toString(),
      :Actual = targetPremium.toString(),
      :Passed = variancePercent < 0.01,  // Allow 0.01% variance for rounding
      :Message = variancePercent >= 0.01 ? "Variance of ${variancePercent}%" : null
    })

    return results
  }
}

Migration Checklist

Phase	Task	Owner	Status
Assessment	Complete inventory	PM	[ ]
Assessment	Risk analysis	Architect	[ ]
Planning	Data migration plan	Data Lead	[ ]
Planning	Integration cutover plan	Integration Lead	[ ]
Build	Configuration migration	Dev Team	[ ]
Build	Integration updates	Integration Team	[ ]
Test	UAT completion	QA Lead	[ ]
Test	Performance testing	Performance Team	[ ]
Migrate	Data migration execution	Data Team	[ ]
Migrate	Cutover execution	Ops Team	[ ]
Validate	Post-migration validation	QA Team	[ ]
Optimize	Performance tuning	Dev Team	[ ]

Output

• Assessment and discovery framework
• Data migration plan and executor
• Integration cutover strategy
• Validation framework
• Migration checklist

Resources

• Guidewire Cloud Migration Guide
• Data Migration Best Practices
• Cutover Planning Guide

Conclusion

This skill pack provides comprehensive guidance for Guidewire InsuranceSuite development and operations. For additional support, contact Guidewire Support or consult the Guidewire Community.